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The formula for voltage is: E = I x R
(E is voltage measured in volts, I is current measured in amperes or amps, R is resistance measured in ohms).
Sample problem:
An Mp3 player has 40 ohms of resistance and 0.1 amps of current flowing through it. What is the voltage that supplies the Mp3 player?
Start with the formula, E = I x R.
Put the values given into the formula: E = 0.1 x 40
Now, do the math: E = 4 volts
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∙ 11y ago
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