Homework Help: Physics

Posted by Jon on Wednesday, April 9, 2008 at 2:52pm.

1)A 2.0-V battery is connected in a circuit with an ammeter and an unknown resistor, P. The current is observed to be 0.70 A. What would be the current in the circuit if a 12-V battery replaces the 2.0-V battery?

A)4.2 A
B)6.0 A
C)8.4 A
D)34 A

I got A

2)Which appliance consumes the most power?

A)tv. potential difference = 24 current = 0.75
B)drill. potential difference = 110 current = 1.6
C)bulb. potential difference = 12 current = 4.0
D)amplifier. potential difference = 110 current = 0.2

24^2/0.75
768

110^2/1.6
7562.5

12^2/4.0
36

110^2/0.2
60500

I got D

Physics - bobpursley, Wednesday, April 9, 2008 at 3:25pm
right on 1, but on 2) your work makes no sense.

Powerconsumed= V*I you are given v, and current for each .
Physics - Jon, Wednesday, April 9, 2008 at 3:35pm
on 2) i don't understand do I just multiply potential difference and current and find the largest of the bunch?
Physics - bobpursley, Wednesday, April 9, 2008 at 4:07pm
yes, you are looking for the max power.
Physics - Jon, Wednesday, April 9, 2008 at 4:24pm
1) B
Physics - bobpursley, Wednesday, April 9, 2008 at 4:31pm
for the second one, B is the correct answer.

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