July 2012
Beginner
576 pages
9h 46m
English
Content preview from Complete Electronics Self-Teaching Guide with Projects
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Ohm's Law
4 Ohm's law states the fundamental relationship between voltage, current, and resistance.
Question
What is the algebraic formula for Ohm's law? _____
Answer
This is the most basic equation in electricity, and you should know it well. Some electronics books state Ohm's law as E = IR. E and V are both symbols for voltage. This book uses V to indicate voltage. When V is used after a number in equations and circuit diagrams, it represents volts, the unit of measurement of voltage. Also, in this formula, resistance is the opposition to current flow. Larger resistance results in smaller current for any given voltage.
5 Use Ohm's law to find the answers in this problem.
Questions
What is the voltage for each combination of resistance and current values?
A. R = 20 ohms, I = 0.5 amperes
V = _____
B. R = 560 ohms, I = 0.02 amperes
V = _____
C. R = 1,000 ohms, I = 0.01 amperes
V = _____
D. R = 20 ohms I = 1.5 amperes
V = _____
Answers
A. 10 volts
B. 11.2 volts
C. 10 volts
D. 30 volts
6 You can rearrange Ohm's law to calculate current values.
Questions
What is the current for each combination of voltage and resistance values?
A. V = 1 volt, R = 2 ohms
I = _____
B. V = 2 volts, R = 10 ohms
I = _____
C. V = 10 volts, R = 3 ohms
I = _____
D. V = 120 volts, R = 100 ohms
I = _____
Answers
A. 0.5 amperes
B. 0.2 amperes
C. 3.3 amperes
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