Unit: Electricity and Magnetism
Year: 1991 Question#: 30
Question: The diagram below represents a series circuit containing three resistors. What is the current through resistor R2?
(1 ) 1.0 A
(2 ) 0.33 A
(3 ) 3.0 A
(4 ) 9.0 A
What is this question really asking?
Explanation by: Gabriel F
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Answer 1
A) 1.0A
INCORRECT
If you take the formula V=IR and plug the numbers in, you get 3V/9 ohms=I which is not equal to 1.0 Amps. return to top
Answer 2
2)0.33 Amps
CORRECT
Determine the current by V=IR. The answer is .33 Amps as shown in the first explanation.
You must also realize that for a series circuit the current is the same in all parts of the circuit.
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Answer 3
3 Amps.
INCORRECT
3.0 Amps does not fit the formula V=IR return to top
Answer 4
9.0 Amps.
INCORRECT
9.0 Amps does not correctly fit the formula V=IR. return to top
What's this question really asking?
It is asking if you understand the fundamentals of electricity: resisance, current, and voltage in a series circuit. return to top
