Physics

Question 1

1Find the current drawn by a 2,000 W, 240 V appliance.

Easy

A. 480,000 A B. 0.12 A C. 16.67 A D. 8.33 A

Question 2

2Domestic appliances are connected in parallel so that

Easy

A. each receives the full mains voltage and can be switched independently B. current is the same in each C. fewer wires are needed D. they share the voltage

Question 3

3Find the power dissipated in a 6 Ω resistor connected across 240 V.

Easy

A. 9,600 W B. 40 W C. 345,600 W D. 1,440 W

Question 4

4A 100 W bulb uses 1 kWh of energy in 10 hours.

Easy

A. True B. False

Question 5

5Electrical power is given by

Easy

A. P = IV B. P = I + V C. P = V/I D. P = I/V

Question 6

6A 1 kW appliance used for 2 hours consumes ___ kWh.

Easy

Your answer (fill in the blank)

Question 7

7The heating element of an electric iron is made of nichrome because it has

Medium

A. high conductivity B. low resistance C. high resistivity and high melting point D. low melting point

Question 8

8In the standard colour code, the live wire is

Easy

A. brown B. green and yellow C. blue D. black

Question 9

9A circuit breaker differs from a fuse in that it

Easy

A. can be reset after tripping B. melts C. increases current D. works only with d.c.

Question 10

10A 1 kW appliance used for 4 hours consumes ___ kWh.

Easy

Your answer (fill in the blank)