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WORKBOOK PAGE: Chapter 23 Electric Current Ohm's Law
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Terms in this set (11)
How much current flows in a 1000-ohm resistor when 1.5 volts are impressed across it?
0.0015A
If the filament resistance in an automobile headlamp is 3 ohms, how many amps does it draw when connected to a 12-volt battery?
4A
The resistance of the side lights on an automobile are 10 ohms. How much current flows in them when connected to 12 volts?
1.2A
What is the current in the 30-ohm heating coil of a coffee maker that operates on a 120-volt circuit?
4A
What is the current initially through the fingers?
0.000015A (15 microamperes)
What is the current when the resistance between them drops?
0.000030A
How much resistance would allow an impressed voltage of 6 V to produce a current of 0.006 A?
1000 ohms
What is the resistance of a clothes iron that draws a current of 12 A at 120 V?
10 ohms
What is the voltage across a 100-ohm circuit element that draws a current of 1 A?
100V
What voltage will produce 3 A through a 15-ohm resistor?
45V
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.
Yes, the resistance increases with greater current and therefore higher temperature. At 0.2A, the resistance R=10 V/0.2A = 50, r+ 120 V/0.5A=240
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