Ohm's Law
The quantitative relationship among voltage, current, and resistance
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The Physics
B) Resistance (Ohms) Symbol - Ω
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Scientific Advisors: Dr. Saul Dushman; Dr. Roman
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Meet Georg Ohm — the physicist behind the law
Ohm's Law
1) R = V/I (at constant T)
V - Potential difference (voltage) between ends of conductor (volts)
I - current (amperes)
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Georg Ohm - (1789 - 1854) - German This image (or other media
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Cross Multiply: V = IR
V directly related to I
Since ....
R = V/I
Slope of V, I plot = ???
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Plot of Current and R? R = V/I
Enrichment
Monterey Institute for
(Go to Lesson 3)
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Check Your Understanding
5 quick questions — pick an answer to see if you’re right.
1. Ohm's Law states that resistance equals:
2. A 12 V battery is connected across a 4.0 Ω resistor. What is the current?
3. A current of 2.0 A flows through a 6.0 Ω resistor. What is the potential difference across it?
4. For a resistor, voltage (V) is plotted on the y-axis and current (I) on the x-axis. The slope equals:
5. The voltage across a resistor at constant temperature is doubled. What happens to the current?