Unit: Electricity and Magnetism
Year: 1996 Question#: 32
Question: The diagram below shows the current in a segment of a direct current circuit.
What is the reading of ammeter A?
(1 ) 1 A
(2 ) 5 A
(3 ) 7 A
(4 ) 8 A
What is this question really asking?
Explanation by: Jessica S
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Answer 1
1 A
INCORRECT
Whatever current enters a junction must also leave it. With that in mind, try this problem again. return to top
Answer 2
5 A
CORRECT
Whatever current enters a junction must also leave it. 9 Amps of current enter this junction, so 9 amps of current must leave it. Since we know 4 are leaving it already, the missing value must be 5, since 5 + 4 = 9, the amount entering the junction. return to top
Answer 3
7 A
INCORRECT
Whatever current enters a junction must also leave it. With that in mind, try this problem again. return to top
Answer 4
8 A
INCORRECT
Whatever current enters a junction must also leave it. With that in mind, try this problem again. return to top
What's this question really asking?
This question is testing your understanding of the fact that any current entering a junction must also leave the junction. return to top
