What is power. Power is how much strength is required to push an article. Before knowing how to calculate the power, Just understand how the power is scale . Power scaled by (W) Watt. Power can be calculated as followed. Power(W) =Current(Ah) * Voltage (V). A -> amperes. V->Volt W -> Power Example 1 A video uses 30 A at 12 V. Its power requirement in watts is: 30 A × 12 V = 360 W Example 2 A pump uses 10 A at 48 V. Its power requirement in watts is: 10 A × 48 V = 480 W Example 3 A light uses 1.5 A at 12 V. Its power requirement is: 1.5 A × 12V = 18W Example 4 If a refrigerator using 120 W requires a current of 10 A, what voltage is present? ?? V × 10 A = 120 W 120W ÷ 10A = 12 V And Final one : Practical Question If a 24 W light is connected to a 12 V source of electricity, how much current will flow? 12 V × ?? A = 24 W 24 ÷ 12 = 2 A What is Energy? The terms power and energy are often confused....
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