Ohm's & Watt's Laws define the relationships between (P or W) power in Watts, (E or V) voltage in Volts, (I or A)
current in Amps/Amperes, and (R) resistance in Ohms.
Ohm's Law: E = IR ; I = E/R ; R = E/I
In direct
current resistive circuits, instantaneous
electrical power is calculated using Watt’s Law:
Watt’s Law: P = EI ; I2R ; E2/R