PhysicsLAB CP Workbook
Ohm's Law

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How much current flows in a 1000-ohm resistor when 1.5 volts are impressed across it? 

If the filament resistance in an automobile headlamp is 3 ohms, how many amps does it draw when connected to a 12-volt battery? 

The resistance of the side lights on an automobile are 10 ohms. How much current flows in them when connected to 12 volts? 

What is the current in the 30-ohm heating coil of a coffee maker that operates on a 120-volt circuit? 


What is the resistance of a clothes iron that draws a current of 12 A at 120 V? 

What is the voltage across a 100-ohm circuit element that draws a current of 1 A? 

What voltage will produce 3 A through a 15-ohm resistor? 

The current in an incandescent lamp is 0.5 A when connected to a 120-V circuit, and 0.2 A when connected to a 10-V source. Does the resistance of the lamp change in these cases? Explain your answer and defend it with numerical values. 

Refer to the following information for the next three questions.

During a lie detector test, a voltage of 6 V is impressed across two fingers. When a certain question is asked, the resistance between the fingers drops from 400 000 ohms to 200 000 ohms.
What is the current initially through the fingers? 

What is the current when the resistance between them drops? 

How much resistance would allow an impressed voltage of 6 V to produce a current of 0.006 A? 




 
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