Which formula expresses electrical power in a DC circuit?

Which formula expresses electrical power in a DC circuit?

• A. Power = volts × amps
• B. Power = volts ÷ amps
• C. Power = amps × ohms
• D. Power = watts ÷ volts

Answer: (A)

Power in a DC circuit comes from multiplying the voltage across a component by the current through it, giving power in watts. So the expression volts × amps matches P = V × I, which is the direct formula for electrical power. The other options don’t compute power: dividing voltage by current would give resistance (V/I = R); multiplying current by ohms would yield volts (I × R = V); and watts divided by volts would give current (P/V = I) rather than a direct power formula.

Power in a DC circuit comes from multiplying the voltage across a component by the current through it, giving power in watts. So the expression volts × amps matches P = V × I, which is the direct formula for electrical power. The other options don’t compute power: dividing voltage by current would give resistance (V/I = R); multiplying current by ohms would yield volts (I × R = V); and watts divided by volts would give current (P/V = I) rather than a direct power formula.