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Voltage
Amount of energy available to move electrons from one point to another.
Current
Rate of charge flow in a particular direction.
Resistance
Opposition to current.
Ohm's Law
Relates voltage (V), current (I), and resistance (R) stating that V is proportional to I, with R as the constant of proportionality.
V = I * R
The formula representing Ohm's Law, where V is voltage, I is current, and R is resistance.
Effect of Increasing Voltage
When voltage increases while resistance is constant, current increases.
Effect of Decreasing Resistance
When resistance decreases while voltage is constant, current increases.
Inverse Relationship
As resistance increases, current decreases if voltage is held constant.
Application of Ohm’s Law
Can be used to calculate current, voltage, or resistance in circuits.
Ammeter
Device used to measure current in a circuit.