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# Electronics - Resistance and Power

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### Exercise

"Love is like a war, Easy to begin Hard to end."
- (Proverb)
1.

The resistivity of copper is:

 A. 9.9 B. 10.7 C. 16.7 D. 17

2.

How do fixed resistors usually fail?

 A. slowly over time B. by increasing their value C. by becoming an open circuit D. by increasing their value and becoming an open circuit

3.

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

 A. current remains the same B. power decreases C. current increases D. resistance decreases

4.

Which formula shows a direct proportionality between power and voltage?

 A. V = IR B. P = VI C. P = IR D. I = V/R

5.

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

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