Usually wire resistance can be neglected. But we see the effect of it 4-4 10 pes sometimes when a light dims as another high-current device is turned on. In the fridge, the bulb will put out a little less power when the switch to the compressor motor is turned on. Refrigerator Bulb R, = wire resistance Switch R, ww Motor (a) The voltage source (wiggly circled curve) is 120 V (treat it like a battery) and the wire resistance is 0.5 ohms. The bulb is rated as "75W", which means its power is 7sW when connected to 120 V. What is the resistance of the bulb? ohms ( +0.1 ohms) 192 (b) When the switch to the motor is open (preventing that branch of the circuit from receiving current, so you can pretend it is not even there), find the power consumed by the bulb, which should be a little lower than 75W because of the wire resistance. W(+0.1 W) (c) The motor has a resistance of 10.6 ohms . When the motor switch is closed (meaning that branch of the circuit now has current flowing through it), what power does the bulb consume? W(+0.1 W) (d) What power is consumed by the motor? kW (+0.01 kW) Source Operstax Physics 2013 Problem 219, mod BCH
Attached is the picture with the question on it, but here are the questions typed out if its hard to read.
Also, I need the answers correct to 4 decimal places, thank you!!!
Usually wire resistance can be neglected. But we see the effect of it sometimes when a light dims as another high-current device is turned on. In the fridge, the bulb will put out a little less power when the switch to the compressor motor is turned on.
a. The voltage source (wiggly circled curve) is 120 V (treat it like a battery) and the wire resistance is 0.5 ohms. The bulb is rated as "75W", which means its power is 75W when connected to 120 V. What is the resistance of the bulb? (ohms)
b. When the switch to the motor is open (preventing that branch of the circuit from receiving current, so you can pretend it is not even there), find the power consumed by the bulb, which should be a little lower than 75W because of the wire resistance. (W)
c. The motor has a resistance of 10.6 ohms . When the motor switch is closed (meaning that branch of the circuit now has current flowing through it), what power does the bulb consume? (W)
d. What power is consumed by the motor? (in kW)
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