Electrical and electronic circuits

Question 1 of 10

A diode in a circuit allows current to flow

A. in one direction only B. in both directions equally C. only when cold D. only at night

Question 2 of 10

Three 9 Ω resistors in parallel give

A. 9 Ω B. 27 Ω C. 3 Ω D. 1 Ω

Question 3 of 10

The power used by a device with 5 A at 12 V is

A. 60 W B. 17 W C. 2.4 W D. 7 W

Question 4 of 10

A 12 V battery rated 60 Ah can deliver 3 A for about

A. 20 hours B. 5 hours C. 180 hours D. 4 hours

Question 5 of 10

An LED is usually connected with a resistor in series in order to

A. change AC to DC B. make it brighter than its rating C. store charge D. limit the current so the LED is not damaged

Question 6 of 10

A switch in a circuit is used to

A. open or close the circuit B. store energy C. measure current D. produce light

Question 7 of 10

Ohm's law states that

A. V = IR B. P = IV only C. Q = It D. E = mc²

Question 8 of 10

A breadboard is used to

A. build and test circuits without soldering B. cut wood C. print circuits D. store batteries

Question 9 of 10

A circuit breaker

A. automatically switches off the circuit when current is too high B. increases voltage C. stores energy D. produces light

Question 10 of 10

The power dissipated in a 100 Ω resistor carrying 0.2 A is

A. 4 W B. 20 W C. 0.4 W D. 2 W

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New set of questions

Questions written by OtisamLMS in the style of the WASSCE. They are not WAEC past questions.

Past questions, worked solutions and curriculum-mapped study material for JHS and SHS students and teachers in Ghana.

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