Basic Electrical Theory
UNITS OF ELECTRICAL MEASUREMENT
Resistance of a circuit is equal to the applied voltage divided by the circuit current.
Equation (1-4) is a mathematical representation of this concept.
R (or W)
I = current (A)
E = voltage (V)
R = resistance (W)
If any two of the component values are known, the third can be calculated.
Given that I = 2 A, E = 12 V, find the circuit resistance.
Since applied voltage and circuit current are known, use Ohms Law to solve for
Given E = 260 V and R = 240 W, what current will flow through a circuit?
Since applied voltage and resistance are known, use Ohms Law to solve for