Canadian Basic pool, section 5-06

Basic

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Subelement 5

Basic Electronics and Theory

Section 5-06

power law, resistor power dissipation

5-06-01

Why would a large size resistor be used instead of a smaller one of the same resistance?

A.
For better response time
B.
For a higher current gain
C.
For less impedance in the circuit
Correct Answer
D.
For greater power dissipation

5-06-01

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5-06-02

How many watts of electrical power are used by a 12-VDC light bulb that draws 0.2 ampere?

Correct Answer
A.
2.4 watts
B.
60 watts
C.
24 watts
D.
6 watts

5-06-02

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5-06-03

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

A.
20 watts
Correct Answer
B.
6 watts
C.
500 watts
D.
12 watts

5-06-03

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5-06-04

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

A.
1 watt
Correct Answer
B.
2 watts
C.
1/2 watt
D.
4 watts

5-06-04

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5-06-05

When two 500 ohm 1 watt resistors are connected in parallel, they can dissipate a maximum total power of:

A.
1/2 watt
B.
1 watt
Correct Answer
C.
2 watts
D.
4 watts

5-06-05

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5-06-06

If the voltage applied to two resistors in series is doubled, how much will the total power change?

Correct Answer
A.
increase four times
B.
decrease to half
C.
double
D.
no change

5-06-06

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5-06-07

If the power is 500 watts and the resistance is 20 ohms, the current is:

A.
2.5 amps
B.
10 amps
C.
25 amps
Correct Answer
D.
5 amps

5-06-07

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5-06-08

A 12 volt light bulb is rated at a power of 30 watts. The current drawn would be:

Correct Answer
A.
30/12 amps
B.
18 amps
C.
360 amps
D.
12/30 amps

5-06-08

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5-06-09

If two 10 ohm resistors are connected in series with a 10 volt battery, the power consumption would be:

Correct Answer
A.
5 watts
B.
10 watts
C.
20 watts
D.
100 watts

5-06-09

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5-06-10

One advantage of replacing a 50 ohm resistor with a parallel combination of two similarly rated 100 ohm resistors is that the parallel combination will have:

A.
the same resistance but lesser power rating
B.
greater resistance and similar power rating
Correct Answer
C.
the same resistance but greater power rating
D.
lesser resistance and similar power rating

5-06-10

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5-06-11

Resistor wattage ratings are:

A.
calculated according to physical size
B.
expressed in joules per second
Correct Answer
C.
determined by heat dissipation qualities
D.
variable in steps of one hundred

5-06-11

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