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Electronics & Communication Engineering - Basic Electronics

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49.

A damaged resistor

A.	may appear burned	B.	may have an increased resistance value
C.	may be checked with an ohmmeter	D.	All of the above

50.

Power supplies differ from batteries in that

A.	power supply output voltages are ac and not dc	B.	power supply voltages are not stable
C.	power supplies are low-current devices	D.	None of the above

51.

If voltage across a resistance doubles

A.	the current is halved	B.	the resistance doubles
C.	the current is unchanged	D.	none of the above

52.

Ohm's law describes the mathematical relationship between

A.	ohms, kilohms, and megohms	B.	resistor size and resistor value
C.	resistance, voltage, and current	D.	none of the above

53.

Energy is defined as the ability to

A.	produce heat	B.	produce light
C.	produce sound	D.	All of the above

54.

What electromotive force would cause 20 A of current to flow through a 500Ωâresistor?

A.	0.04 V	B.	2.5 V
C.	25.0 V	D.	10,000 V

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