Which of the following is an INCORRECT formula for power?
I²Rt
To determine which formula is incorrect for calculating electrical power, let's examine each option:
I²R: This is a correct formula for power, derived from substituting Ohm's Law into the power formula P = VI, where V = IR. Thus, P = I(IR) = I²R.
V²/R: This is also a correct formula for power. By using Ohm's Law (I = V/R) in the formula P = VI, and substituting I, we get P = V(V/R) = V²/R.
VI: This is the basic and fundamental formula for calculating power, where P = VI, where P is power, V is voltage, and I is current.
I²Rt: This formula is incorrect for power. It represents energy dissipation as heat over time, not power. Power is calculated using I²R but is not multiplied by time t.
Thus, the incorrect formula for power is I²Rt.
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Important Questions from Power
Express the power dissipated in a 100 Ω resistor in dB relative to 1 mW, when the voltage across the resistor is 1.0 Vrms
An elevator weighing 500 kg is to be lifted up at a constant velocity of 0.25 m/s. What would be the minimum horsepower of the motor to be used? G = 9.8 m/s2 and there is no frictional loss.
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Which of the following is not equivalent of Watts?
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