#10. Your car\'s 30.0 (W) headlight and 2.40 (kW) starter are ordinarily connect
ID: 2033006 • Letter: #
Question
#10. Your car's 30.0 (W) headlight and 2.40 (kW) starter are ordinarily connected in parallel in a 12.0 (V) system. What power would one headlight and the starter consume if connected in series to a 12.0 (V) battery? A) less than 1(W) B) 1 to 100 (W) C) 101 to 1000 (W) D) 1001 to 10,000 (W) E) more than 10,000 (W) nai #11. Ammeter must be placed in parallel connection in order to measure the current. A) TRUE B) FALSE #12. Using the exact exponential treatment, find how much time is required to discharge a 250 (xF) capacitor through a 500 (f) resistor down to 1.00% of its original voltage. A) less than 0.01 (s) B) 0.01 to 0.1 (s) C) 0.11 to 1 (s) D) 1.1 to 10 (s) E) more than 10 (s)Explanation / Answer
10) We need to solve for the resistance of the headlight and starter:
P = V²/R = 12²/R = 144/R => R = 144/P
For the headlight R = 144/30 = 4.8?
For the starter R = 144/2.4e3 = 0.06?
Connected in series, the total resistance seen by the battery = 4.8+0.06 = 4.86?
12V/4.86V = 2.47A
Power for headlight: 2.47²*4.8 = 29.3W
Power for starter: 2.47²*0.06 = 0.366W
Total power: 29.3 + 0.366 = 29.666 W
So answer is: (B) 1 to 100(W)
11) False
Ammeter must be connected in series.
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