July 2012
Beginner
576 pages
9h 46m
English
Content preview from Complete Electronics Self-Teaching Guide with Projects
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Power
13 When current flows through a resistor, it dissipates power, usually in the form of heat. Power is expressed in terms of watts.
Question
What is the formula for power? _____
Answers
There are three formulas for calculating power:
14 The first formula shown in problem 13 allows power to be calculated when only the voltage and current are known.
Questions
What is the power dissipated by a resistor for the following voltage and current values?
A. V = 10 volts, I = 3 amperes
P = _____
B. V = 100 volts, I = 5 amperes
P = _____
C. V = 120 volts, I = 10 amperes
P = _____
Answers
A. 30 watts.
B. 500 watts, or 0.5 kW. (The abbreviation kW indicates kilowatts.)
C. 1,200 watts, or 1.2 kW.
15 The second formula shown in problem 13 allows power to be calculated when only the current and resistance are known.
Questions
What is the power dissipated by a resistor given the following resistance and current values?
A. R = 20 ohm, I = 0.5 ampere
P = _____
B. R = 560 ohms, I = 0.02 ampere
P = _____
C. V = 1 volt, R = 2 ohms
P = _____
D. V = 2 volt, R = 10 ohms
P = _____
Answers
A. 5 watts
B. 0.224 watts
C. 0.5 watts
D. 0.4 watts
16 Resistors used in electronics generally are manufactured in standard values with regard to resistance and power rating. Appendix D shows a table of standard resistance values for 0.25- and 0.05-watt resistors. ...
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