Power and current relationship equation?

Power and current relationship equation?

• A. P = IV
• B. P = I^2 R
• C. P = V^2 / R
• D. P = V / I

Answer: (A)

Power in an electrical circuit is the rate at which energy is transferred or dissipated, and it equals voltage times current: P = V × I. This is the general relation because voltage provides energy per unit charge, and current is the amount of charge flowing per unit time; multiplying them gives energy per unit time. This formula is the quickest way to find power when you know both voltage and current. If you’re dealing with a resistor, Ohm’s law (V = I R) lets you rewrite the same power in alternative forms: substituting V = I R into P = VI gives P = I^2 R. Or solving for I from V = IR and plugging into P = VI yields P = V^2 / R. The expression P = V / I isn’t a power formula; dividing voltage by current gives resistance, not power, so it doesn’t describe how much power is being delivered.

Power in an electrical circuit is the rate at which energy is transferred or dissipated, and it equals voltage times current: P = V × I. This is the general relation because voltage provides energy per unit charge, and current is the amount of charge flowing per unit time; multiplying them gives energy per unit time.

This formula is the quickest way to find power when you know both voltage and current. If you’re dealing with a resistor, Ohm’s law (V = I R) lets you rewrite the same power in alternative forms: substituting V = I R into P = VI gives P = I^2 R. Or solving for I from V = IR and plugging into P = VI yields P = V^2 / R.

The expression P = V / I isn’t a power formula; dividing voltage by current gives resistance, not power, so it doesn’t describe how much power is being delivered.