- Current always moves from high voltage to low voltage. Therefore, if it passes through a resistor, one end of the resistor (into which the current flows) must be at a higher voltage than the other end (out of which the current flows).
- The difference in voltage between the two ends of a resistor
is called the
**voltage drop**across the resistor. It is equal tovoltage drop = (current) * (resistance)

- Batteries (and power supplies) raise the voltage in a circuit. The long end of a battery symbol is at a higher voltage than the short end. The battery tries to push current away from its positive terminal (long end of the symbol).
- Ohm's Laws describe the behavior of current flowing through
a circuit:
- The magnitude of the current flowing into a junction must equal the magnitude of the current flowing out of that junction.
- The sum of voltage rises and drops around any closed loop in a circuit is equal to zero.

- Using Ohm's Law, one can solve for the current flowing through simple or complex circuits.

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Copyright © Michael Richmond. This work is licensed under a Creative Commons License.