Basic Electrical Theory UNITS OF ELECTRICAL MEASUREMENT3. 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.(1-4)R (or W)EIwhereI = current (A)E = voltage (V)R = resistance (W)If any two of the component values are known, the third can be calculated.Example 1: Given that I = 2 A, E = 12 V, find the circuit resistance.Solution:Since applied voltage and circuit current are known, use Ohm’s Law to solve forresistance.REIR12 V2 A6 WExample 2: Given E = 260 V and R = 240 W, what current will flow through a circuit?Solution:Since applied voltage and resistance are known, use Ohm’s Law to solve forcurrent.IERI260 V240 W1.083 ARev. 0 Page 15 ES-01
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