Basic Electricity . Basic Electrical Terms. Voltage: the driving force, potential symbol is V, units are Volts Resistance: resistance to flow symbol is R, units are Ohms Current: a measure of flow symbol is I, units are Amps Power: rate energy is produced or used
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Higher voltage is just like running a pump at higher
E = I • R
I = E ÷ R
Transmits at high voltageto reduce line losses
480, 600,1K, 10K Vac
Reduces voltageto useable levels
Distributes current andprotects circuits
120, 208,277 Vac
Uses electricity togenerate heat
Subpanel withcircuit breakers
If currents in Line A and Line B are not equal, some current is going to ground through a fault. The ground fault circuit detects this imbalance and trips the circuit breaker.
transformer load = breaker rating x 0.8 x voltage