An electronic device requires a power of 13W when connected toao 27.0 V battery.

Question

An electronic device requires a power of 13W when connected toao 27.0 V battery. How much power is delivered to the device if itis connected to a 22.0 V battery? (Negelct the resistance of thebatteries and assume the resistance of the device does not change.)**Answer should be in W** Thank you sooo much!! An electronic device requires a power of 13W when connected toao 27.0 V battery. How much power is delivered to the device if itis connected to a 22.0 V battery? (Negelct the resistance of thebatteries and assume the resistance of the device does not change.)**Answer should be in W** Thank you sooo much!!

Explanation / Answer

Let's first find the resistance, R, of the electronic device,which remains constant as stated in the problem. P   =   V2 / R 13 W = (27 V)2 / R,   solve for Rto get R = 56.077 ohms. Now, use the same eqn again:   P   = V2 / R = (22 V)2 /56.077ohms = 8.63 Watts.   finalanswer.

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