POWER

Question 1

The voltage applied to two resistors in series is doubled. The total power dissipated will:

increase by four times
decrease to half
double
not change

Question 2

Each of 9 resistors in a circuit is dissipating 4 watt. If the circuit operates from a 12 volt supply, the total current flowing in the circuit is:

48 ampere
36 ampere
9 ampere
3 ampere

Question 3

The DC input power of a transmitter operating at 12 volt and drawing 500 milliamp would be:

6 watt
12 watt
20 watt
500 watt

Question 4

The following two quantities can be multiplied together to find power:

resistance and capacitance
voltage and current
voltage and inductance
inductance and capacitance

Question 5

Three 18 ohm resistors are connected in parallel across a 12 volt supply. The total power dissipation of the resistor load is:

3 watt
18 watt
24 watt
36 watt

Question 6

The current in a 100 kilohm resistor is 10 mA. The power dissipated is:

1 watt
10 watt
100 watt
10,000 watt

Question 7

If two 10 ohm resistors are connected in series with a 10 volt battery, the battery load is:

5 watt
10 watt
20 watt
100 watt

Question 8

A resistor of 10 kilohm carries a current of 20 mA. The power dissipated in the resistor is:

2 watt
4 watt
20 watt
40 watt

Question 9

A resistor in a circuit becomes very hot and starts to burn. This is because the resistor is dissipating too much:

current
voltage
resistance
power

Question 10

The unit for power is the:

ohm
watt
ampere
volt

Question 11

The power delivered to an antenna is 500 watt. The effective antenna resistance is 20 ohm. The antenna current is:

25 amp
2.5 amp
10 amp
5 amp

Question 12

If 200 volt is applied to a 2000 ohm resistor, the resistor will dissipate:

20 watt
30 watt
10 watt
40 watt

Question 13

The following two electrical units multiplied together give the unit "watt":

volt and ampere
volt and farad
farad and henry
ampere and henry

Question 14

A current of 10 ampere rms at a frequency of 50 Hz flows through a 100 ohm resistor. The power dissipated is:

500 watt
707 watt
10,000 watt
50,000 watt

Question 15

When two 500 ohm 1 watt resistors are connected in series, the maximum total power that can be dissipated by both resistors is:

4 watt
2 watt
1 watt
1/2 watt

Question 16

A 20 ohm resistor carries a current of 0.25 ampere. The power dissipated is:

1.25 watt
5 watt
2.50 watt
10 watt

Question 17

When two 1000 ohm 5 watt resistors are connected in parallel, they can dissipate a maximum total power of:

40 watt
20 watt
10 watt
5 watt

Question 18

The power dissipation of a resistor carrying a current of 10 mA with 10 volt across it is:

0.1
0.01
1
10

Question 19

A transmitter power amplifier requires 30 mA at 300 volt. The DC input power is:

300 watt
9000 watt
9 watt
6 watt

Question 20

A current of 500 milliamp passes through a 1000 ohm resistance. The power dissipated is:

0.25 watt
2.5 watt
25 watt
250 watt

ANSWERS

Question 1

The voltage applied to two resistors in series is doubled. The total power dissipated will:

Correct Answer: increase by four times

Question 2

Each of 9 resistors in a circuit is dissipating 4 watt. If the circuit operates from a 12 volt supply, the total current flowing in the circuit is:

Correct Answer: 3 ampere

Question 3

The DC input power of a transmitter operating at 12 volt and drawing 500 milliamp would be:

Correct Answer: 6 watt

Question 4

The following two quantities can be multiplied together to find power:

Correct Answer: voltage and current

Question 5

Three 18 ohm resistors are connected in parallel across a 12 volt supply. The total power dissipation of the resistor load is:

Correct Answer: 24 watt

Question 6

The current in a 100 kilohm resistor is 10 mA. The power dissipated is:

Correct Answer: 10 watt

Question 7

If two 10 ohm resistors are connected in series with a 10 volt battery, the battery load is:

Correct Answer: 5 watt

Question 8

A resistor of 10 kilohm carries a current of 20 mA. The power dissipated in the resistor is:

Correct Answer: 4 watt

Question 9

A resistor in a circuit becomes very hot and starts to burn. This is because the resistor is dissipating too much:

Correct Answer: power

Question 10

The unit for power is the:

Correct Answer: watt