Electronics And Communication Test Preparations On Resistance and Power Part 1

Test Preparation on Electronics And Communication Test Preparations On Resistance and Power Part 1

1.

How do fixed resistors usually fail?

1slowly over time
2by increasing their value
3by becoming an open circuit
4by increasing their value and becoming an open circuit

2.

With Ohm's law, if voltage increases and resistance stays the same:

1current remains the same
2power decreases
3current increases
4resistance decreases

3.

Which formula shows a direct proportionality between power and voltage?

1V = IR
2P = VI
3P = IR
4I = V/R

4.

With 1 mA of current, what wattage rating should a 470 ohm resistor have?

11/4 watt
21/2 watt
31 watt
42 watts

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