Engineering

Question 1

1Ohm's law states that

Easy

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

Question 2

2A breadboard is used to

Easy

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

Question 3

3A switch in a circuit is used to

Easy

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

Question 4

4An LED is usually connected with a resistor in series in order to

Easy

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

Question 5

5A 12 V battery rated 60 Ah can deliver 3 A for about

Hard

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

Question 6

6In a parallel circuit, each branch has

Easy

A. double the supply voltage B. the same voltage across it C. no current D. the same current through it

Question 7

7The power dissipated in a 100 Ω resistor carrying 0.2 A is

Hard

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

Question 8

8The total resistance of 2 Ω, 4 Ω and 6 Ω in series is

Easy

A. 6 Ω B. 12 Ω C. 1.09 Ω D. 48 Ω

Question 9

9A circuit breaker

Easy

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

Question 10

10The power used by a device with 5 A at 12 V is

Easy

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