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The Power P (Watts) in an Electric Circuit Is Related

Question 39

Multiple Choice

The power P (watts) in an electric circuit is related to the circuit's resistance R (ohms) and the current I (amperes) by the equation P = R I2. If the power of a circuit is a constant 40 watts and the resistance R is decreasing at the constant rate of 4 ohms /s, at what rate is the current I changing at the instant the current is 2 amperes?


A) The current is decreasing at the rate of The power P (watts) in an electric circuit is related to the circuit's resistance R (ohms) and the current I (amperes) by the equation P = R I<sup>2</sup>. If the power of a circuit is a constant 40 watts and the resistance R is decreasing at the constant rate of 4 ohms /s, at what rate is the current I changing at the instant the current is 2 amperes? A) The current is decreasing at the rate of amperes / s. B) The current is increasing at the rate of amperes / s. C) The current is decreasing at the rate of amperes / s. D) The current is increasing at the rate of amperes / s. E) The current is decreasing at the rate of amperes / s. amperes / s.
B) The current is increasing at the rate of The power P (watts) in an electric circuit is related to the circuit's resistance R (ohms) and the current I (amperes) by the equation P = R I<sup>2</sup>. If the power of a circuit is a constant 40 watts and the resistance R is decreasing at the constant rate of 4 ohms /s, at what rate is the current I changing at the instant the current is 2 amperes? A) The current is decreasing at the rate of amperes / s. B) The current is increasing at the rate of amperes / s. C) The current is decreasing at the rate of amperes / s. D) The current is increasing at the rate of amperes / s. E) The current is decreasing at the rate of amperes / s. amperes / s.
C) The current is decreasing at the rate of The power P (watts) in an electric circuit is related to the circuit's resistance R (ohms) and the current I (amperes) by the equation P = R I<sup>2</sup>. If the power of a circuit is a constant 40 watts and the resistance R is decreasing at the constant rate of 4 ohms /s, at what rate is the current I changing at the instant the current is 2 amperes? A) The current is decreasing at the rate of amperes / s. B) The current is increasing at the rate of amperes / s. C) The current is decreasing at the rate of amperes / s. D) The current is increasing at the rate of amperes / s. E) The current is decreasing at the rate of amperes / s. amperes / s.
D) The current is increasing at the rate of The power P (watts) in an electric circuit is related to the circuit's resistance R (ohms) and the current I (amperes) by the equation P = R I<sup>2</sup>. If the power of a circuit is a constant 40 watts and the resistance R is decreasing at the constant rate of 4 ohms /s, at what rate is the current I changing at the instant the current is 2 amperes? A) The current is decreasing at the rate of amperes / s. B) The current is increasing at the rate of amperes / s. C) The current is decreasing at the rate of amperes / s. D) The current is increasing at the rate of amperes / s. E) The current is decreasing at the rate of amperes / s. amperes / s.
E) The current is decreasing at the rate of The power P (watts) in an electric circuit is related to the circuit's resistance R (ohms) and the current I (amperes) by the equation P = R I<sup>2</sup>. If the power of a circuit is a constant 40 watts and the resistance R is decreasing at the constant rate of 4 ohms /s, at what rate is the current I changing at the instant the current is 2 amperes? A) The current is decreasing at the rate of amperes / s. B) The current is increasing at the rate of amperes / s. C) The current is decreasing at the rate of amperes / s. D) The current is increasing at the rate of amperes / s. E) The current is decreasing at the rate of amperes / s. amperes / s.

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