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Answer: The resistance of an ammeter should be low so that it will not disturb the magnitude of current flowing through the circuit when connected in series in a circuit. Question 3: How does use of a fuse wire protect electrical appliances?
Answer: The fuse wire is always connected in series with the live wire or electrical devices. If the flow of current exceeds the specified preset value due to some reason, the heat produced melts it and disconnects the circuit or the device from the mains. In this way, fuse wire protects the electrical appliances. Question 4: What is electrical resistivity? In a series electrical circuit comprising a resistor made up of a metallic wire, the ammeter reads 5 A.
The reading of the ammeter decreases to half when the length of the wire is doubled. Answer: The resistance offered by a metallic wire of unit length and unit cross-sectional area is called electrical resistivity. Hence, when the length of wire is doubled, the resistance becomes double and current decreases to half. Calculate the resistance of the electric lamp.
Question 6: Why is parallel arrangement used in domestic wiring? Answer: Parallel arrangement is used in domestic wiring because i Each appliance gets the same voltage as that of the mains supply. Question 7: B 1, B 2 and B 3 are three identical bulbs connected as shown in figure. When all the three bulbs glow, a current of 3A is recorded by the ammeter A. Answer: i Since B 1 ,B 2 and B 3 are in parallel, the potential difference across each of them will remain same.
So when the bulb B 1 gets fused, B 2 and B 3 have the same potential and continues with the same energy dissipated per second, i. Question 1: Three incandescent bulbs of W each are connected in series in an electric circuit. In another circuit, another set of three bulbs of the same wattage are connected in parallel to the same source.
Justify your answer. Will the rest of the bulbs continue to glow in each circuit? Answer: a The bulbs in the two circuits will not glow equally bright as the current through them is not the same.
While the rest of bulbs in parallel circuit will continue to glow without getting disturbed because in parallel combination, current gets additional paths to flow. Question 2: Find out the following in the electric circuit given in figure: Answer: e No difference, since the ammeters are connected in series and same current will pass through them, so reading of both ammeters will be same.
Question 1. To determine the equivalent resistance of two resistors when connected in series, a student arranged the circuit components as shown in the diagram. But he did not succeed to achieve the objective. Question 2. For the given circuit, name the components which are connected in parallel. Because terminals of the resistance and voltmeter are connected together.
Question 3. A student arranges the following circuit to get equivalent resistance of a series combination of two resistors R 1 and R 2. Which one of the following statements will be true for this circuit [CCE ] a It gives incorrect reading for current I as well as potential difference V b It gives correct reading for current I but incorrect reading for potential difference V c It gives correct reading for potential difference V but incorrect reading for current I d It gives correct reading for both I and V Answer: b The voltmeter should be connected across the components of and R 2 to give correct reading for potential difference.
Question 4. An ammeter has 20 divisions between 0 mark and 2A mark on its scale. The least count of ammeter is a 0. Question 5. A student finds that there are 20 divisions between zero mark and 1V mark of a voltmeter. The least count of voltmeter is a 0. Question 6. The current flowing through a resistor connected in an electric circuit and the potential difference applied across its ends are shown in figure alongside.
Question 7. Question 8. In an experiment on studying the dependence of the current I flowing through a given resistor on the potential difference V applied across it, a student has to change the value of the current. For doing this, he should change the a number of cells used b resistor itself c ammeter used in the circuit d Voltmeter used in the circuit Answer: a If we change the number of cells in electric circuit, the potential difference will change and as a result current flowing in the circuit changes.
Question 9. A milliammeter had graduations marked 0, , , , and The space between 0 mark and mark is divided into 20 divisions. Question To determine the eguivalent resistance of two resistors connected in series, a student prepared two electric circuits, correct reading of ammeter in the circuits is [CCE ] a In circuit I, 1.
When parallel resistors are of three different values, the potential difference across its terminals is [CCE ] a greatest across smallest resistance b greatest across largest resistance c equal across each resistance d least across the smallest resistance Answer: c Potential difference across each resistor is same in parallel combination of resistors.
Charge Something associated with the matter due to which it produces and experiences electric and magnetic effects. Resides on the outer surface of the conductor. Types of Current Direct Current Current whose magnitude and direction does not vary with time.
Alternating Current Current whose magnitude and direction periodically changes with time. Resistance R : Obstruction offered to flow of electrons. After stretching, if length increases by n times then resistance will increase by n 2 times i.
Electric Circuit The arrangement of various electrical components along which electric current flow. Heating Effect of Electric Current As current flows through a conductor, the free electrons lose energy which is converted into heat. Elements of Circuit Cell Direct current source of electromotive force. Combination of two or more cells is called battery. Rheostat Wire of special type of alloy like manganin, Eureka, nichrome, etc.
It controls the current in the electric circuit. Switch It is used to close or open the electric circuit, controls the movement of electrons in a circuit. Voltmeter Measures the potential difference between two points in the circuit. Its resistance is high and it is used in parallel with the resistance wire.
Fuse It is a safety device having very thin wire which is made up of either tin or alloy of tin and lead. This wire has low melting point so it melts and breaks the circuit easily if the current in the circuit exceeds. Ammeter Measures the value of current flowing in the circuit. The resistance of ammeter is small and it is used in series with the circuit.
LED It is a device which glows even if a weak electric current is allowed to flow through it. If you have any doubt regarding this article or NCERT Solutions For Class 10 Science Chapter 12 Electricity, leave your comments in the comment section below and we will get back to you as soon as possible.
Page Number: Question 1 On what factors does the resistance of a conductor depend? Answer: Advantages of connecting electrical devices in parallel with the battery are : In parallel circuits, if an electrical appliance stops working due to some defect, then all other appliances keep working normally. In parallel circuits, each electrical appliance has its own switch due to which it can be turned on turned off independently, without affecting other appliances. In parallel circuits, each electrical appliance gets the same voltage V as that of the power supply line.
In the parallel connection of electrical appliances, the overall resistance of the household circuit is reduced due to which the current from the power supply is high. Page Number: Question 1 Why does the cord of an electric heater not glow while the heating element does?
Since current varies linearly with potential difference, the graph between V and I will be a linear in nature as shown. Draw a schematic diagrams of an electric circuit comprising of 3 cells and an electric bulb, ammeter, plug-key in the ON mode and another with same components but with two bulbs in parallel and a voltmeter across the combination. Out of the two wires X and Y shown below, which one has greater resistance? Justify your answer.
It is because resistance of wire is directly proportional to the length of wire. Two identical wires one of nichrome and other of copper are connected in series and a current I is passed through them. State the change observed in the temperatures of the two wires. State the law which explains the above observation. The resistivity of nichrome is more than that of copper so its resistance is also high. Therefore, large amount of heat is produced in the nichrome wire for the same current as compared to that of copper wire.
Accordingly, more change in temperature is observed in the nichrome wire. An electric bulb is rated at 60 W, V. Calculate its resistance. If the voltage drops to V, calculate the power consumed and the current drawn by the bulb.
Assume that the resistance of the bulb remain unchanged. Current drawn by bulb at V is. Three bulbs each having power P are connected in series in an electric circuit. In another circuit, another set of three bulbs of same power are connected in parallel to the same source. Will the rest of the bulbs continue to glow in each circuit? Give reason. This is because a each bulb gets same voltage and is equal to the applied voltage. Hence, they work properly. This is because in series arrangement, there is only a single path for the flow of current.
In parallel: Rest of the bulbs will continue to glow as in parallel connection, a individual branch in the circuit completes its own circuit, or b different paths are available for the flow of current. Why does it not get burnt up at such high temperature? Calculate the amount of charge flowing through the circuit.
Calculate the capacity of the fuse that should be used for the electric iron. The filament of bulb glows because it becomes red hot due to large amount of heat produced, as it offers high resistance to the flow of current through it. So, amount of charge flowing the filament of electric lamp So, the capacity of the fuse that should be used for the electric iron is of the order of 10 A.
Justify your answer in both the cases. Explain the above statement. This is because So, when A is double, resistance becomes half, current will be doubled. It means 1 J work is done in moving 1 C of charge from point B to point A in an electric field. How is an ammeter connected in a circuit to measure current flowing through it?
In series. What happens to resistance of a conductor when its area of cross-section is increased? A given length of a wire is doubled on itself and this process is repeated once again. By what factor does the resistance of the wire change?
Length becomes one-fourth of the original length and area of cross-section becomes four times that of original. Find the equivalent resistance of the combination. An electric iron has a rating of W, V. Calculate the i current flowing through it, and ii its resistance when in use. Find the resistance of heater when in use. The charge possessed by an electron is 1. Find the number of electrons that will flow per second to constitute a current of 1 ampere.
Explain the role of fuse in series with any electrical appliance in an electric circuit. Why should a fuse with defined rating for an electric circuit not be replaced by one with a larger rating? Fuse wire is a safety device connected in series with the live wire of circuit.
It has high resistivity and low melting point. It melts when a sudden urge of large current passes through it and disconnects the entire circuit from the electrical supply. But, in case if we use a larger rating instead of a defined rating, then it will not protect the circuit as high current will easily pass through it and it will not melt. The wattage of a bulb is 24 W when it is connected to a 12 V battery.
Calculate its effective wattage if it operates on a 6 V battery Neglect the change in resistance due to unequal heating of the filament in the two cases. Consider the following circuit diagram. A torch bulb is rated 2. Calculate i its power, ii its resistance and iii the energy consumed, if this bulb is lighted for four hours. Series arrangements are not used for domestic circuits. List any three reasons. Series arrangements are not used for domestic circuit because. Name the physical quantity which is i same ii different in all the bulbs when three bulbs of: a same wattage are connected in series.
Two devices of rating 44 W, V and 11 W, V are connected in series. The combination is connected across a V mains. The fuse of which of the two devices is likely to burn when the switch is ON? Five resistors are connected in a circuit as shown. Find the ammeter reading when circuit is closed.
Study the circuit shown in which three identical bulbs B 1 , B 2 and B 3 are connected in parallel with a battery of 4. Resistance of. A circuit is shown in the diagram given below. Consider the circuit shown in the diagram. So, A is the longest. So, in the given I-V graph, slope of series combination would be less than that of A. Like this presentation? Why not share! Embed Size px. Start on. Show related SlideShares at end. WordPress Shortcode.
Muskan Jaiswal , Working at Student Follow. Published in: Education. Full Name Comment goes here. Are you sure you want to Yes No. Shamala V. Show More. No Downloads. Views Total views. Actions Shares. No notes for slide. Electricity ppt for class 10 1. What is a Charge? Positive Charge Due to electron deficiency B. Electroscope 7. Methods Charging 3.
This charges the uncharged body. The presence of a charged object near a neutral conductor will polarize the charge within the conductor.
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