In text Q & Answers of page 200 Q-1 What does an electric circuit mean? | |
In text Q & Answers of page 200 Q-3 Calculate the number of electrons constituting one coulomb of charge. | |
In text Q & Answers of page 202 Q-1 Name a device that helps to maintain a potential difference across a conductor. | |
In text Q & Answers of page 202 Q-2 What is meant by saying that the potential difference between two points is 1 V? | |
In text Q & Answers of page 209 Q-1 On what factors does the resistance of a conductor depend? | |
In text Q & Answers of page 209 Q-2 Will current flow more easily through a thick wire or a thin wire of the same material, when connected to the same source? Why? | |
In text Q & Answers of page 209 Q-3 Let the resistance of an electrical component remains constant while the potential difference... | |
In text Q & Answers of page 209 Q-4 Why are coils of electric toasters and electric irons made of an alloy rather than a pure metal? | |
In text Q & Answers of page 213 Q-1
Draw a schematic diagram of a circuit consisting of a battery of three cells of 2 V each, a 5 Ω resistor, an 8 Ω resistor, and a 12 Ω resistor, and a plug key, all connected in series. | |
In text Q & Answers of page 213 Q-2 Redraw the circuit of Q 1, putting in an ammeter to measure the current through the resistors and a voltmeter to measure potential difference across the 12 Ω resistors. What would be the readings in the ammeter and the voltmeter? | |
In text Q & Answers of page 216 Q-1 Judge the equivalent resistance when the following are connected in parallel − (a) 1 Ω and 106Ω, (b) 1 Ω and 103Ω and 106Ω. | |
In text Q & Answers of page 216 Q-2 An electric lamp of 100 Ω, a toaster of resistance 50 Ω, and a water filter of resistance 500 Ω are connected in parallel to a 220 V source...? | |
In text Q & Answers of page 216 Q-3 What are the advantages of connecting electrical devices in parallel with the battery instead of connecting them in series? | |
In text Q & Answers of page 216 Q-4 How can three resistors of resistances 2 Ω, 3 Ω and 6 Ω be connected to give a total resistance of (a) 4 Ω, (b) 1 Ω?
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In text Q & Answers of page 218 Q-1 Why does the cord of an electric heater not glow while the heating element does? | |
In text Q & Answers of page 218 Q-2 Compute the heat generated while transferring 96000 coulomb of charge in one hour through a potential difference of 50 V.
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In text Q & Answers of page 220 Q-1 What determines the rate at which energy is delivered by a current?
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In text Q & Answers of page 220 Q-2 An electric motor takes 5 A from a 220 V line. Determine the power of the motor and the energy consumed in 2 h ? | |
In text Q & Answers of page 200 Q-2 Define the unit of current. | |
In text Q & Answers of page 209 Q-1
In text Question :- On what factors does the resistance of a conductor depend? | |
In text Q & Answers of page 216 Q-5 What is (a) the highest, (b) the lowest total resistance that can be secured by combinations of four coils of resistance 4 Ω, 8 Ω, 12 Ω, 24 Ω?
A | |
In text Q & Answers of page 209 Q-5 Use the data in Table 12.2 to answer the following −
Table 12.2 Electrical resistivity of some substances at 20°C
(a) Which among iron and mercury is a better conductor?
(b) Which material is the best conductor? | |
In text Q & Answers of page 218 Q-3 An electric iron of resistance 20 Ω takes a current of 5 A. Calculate the heat developed in 30 s. | |
In text Q & Answers of page 202 Q-3 How much energy is given to each coulomb of charge passing through a 6 V battery? | |