Worksheets on Electricity

Electricity Worksheet-13

1. Let the resistance of an electrical component remain constant while the potential difference across the two ends of the component decreases to half its former value. What change will occur in the current through it ?

2. Why are coils of electric toasters and electric irons made of an alloy rather than a pure metal ?

3. Draw a schematic diagram of a circuit consisting of a battery of three cells of 2 V each, a 5 ohm resistor, an 8 ohm resistor, and a 12 ohm resistor, and a plug key, all connected in series.

Electricity Worksheet-14

1. Compute the heat generated while transferring 96000 coulombs of charge in one hour through a potential difference of 50 V.

2. An electric iron of resistance 20 takes a current of 5 A. Calculate the heat produced in 30 s.

3. What determines the rate at which energy is delivered by a current .

4. An electric motor takes 5 A from a 220 V line. Determine the power and energy consumed in 2 h.

5. How is voltmeter connected in the circuit to measure potential difference between two points ?

Electricity Worksheet-15

1. 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.

2. 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. How much current would flow through the 12 Ω resistor ?

3. How many 176 Ω resistors (in parallel) are required to carry 5 A in 220 V line ?

4. Show how you would connect three resistors, each of resistance 6 Ω, so that the combination has a resistance of 9 Ω and 2 Ω.