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Questions List of Chapter 3: Electricity
- Question 1 - A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel
- Question 2 - Which of the following terms does not represent electrical power in a circuit?
- Question 3 - An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be –
- Question 4 - Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then parallel in a circuit across the same potential difference.
- Question 5 - How is a voltmeter connected in the circuit to measure the potential difference between two points?
- Question 6 - A copper wire has a diameter 0.5 mm and resistivity of 1.6 × 10–8 Ω m
- Question 7 - The values of current I flowing in a given resistor for the corresponding values of potential difference V across the resistor are given below –
- Question 8 - When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Find the value of the resistance of the resistor.
- Question 9 - A battery of 9 V is connected in series with resistors of 0.2 Ω, 0.3 Ω, 0.4 Ω, 0.5 Ω and 12 Ω, respectively. How much current would flow through the 12 Ω resistor?
- Question 10 - How many 176 Ω resistors (in parallel) are required to carry 5 A on a 220 V line?
- Question 11 - Show how you would connect three resistors, each of resistance 6 Ω, so that the combination has a resistance of (i) 9 Ω, (ii) 4 Ω.
- Question 12 - Several electric bulbs designed to be used on a 220 V electric supply line, are rated 10 W. How many lamps can be connected in parallel with each other across the two wires of 220 V line if the maximum allowable current is 5 A?
- Question 13 - A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 24 Ω resistance, which may be used separately, in series, or in parallel. What are the currents in the three cases?
- Question 14 - Compare the power used in the 2 Ω resistor in each of the following circuits: (i) a 6 V battery in series with 1 Ω and 2 Ω resistors, and (ii) a 4 V battery in parallel with 12 Ω and 2 Ω resistors.
- Question 15 - Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to electric mains supply. What current is drawn from the line if the supply voltage is 220 V?
- Question 16 - Which uses more energy, a 250 W TV set in 1 hr, or a 1200 W toaster in 10 minutes?
- Question 17 - An electric heater of resistance 8 Ω draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater.
- Question 18 - Explain the following.
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