Attaching Meters
Correctly placing ammeters and voltmeters to measure circuit quantities
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Circuit Challenge
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a) I1 = ?
IT = I1 + I2
10.0 A = I1 + 4.0 A
I1 = 6.0 A
b) VT = ?
VT = V1 = V2
V2 = IR
= 4.0 A (30. ohms)
V2 = 120 V
So,
VT = 120 V
Learning-Connections Clipart
Voltmeters
Ammeters
Which circuit is correct?
June 2006
Attaching Meters - Flash showmethephysics.com
Dorling Kindersley Books
Flash Animations for Physics
Choice 4
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Task
Check Your Understanding
5 quick questions — pick an answer to see if you’re right.
1. How should an ammeter be connected to measure the current through a resistor?
2. How should a voltmeter be connected to measure the potential difference across a resistor?
3. A voltmeter measures potential difference. Potential difference is the:
4. In a two-branch parallel circuit, the total current is 10.0 A and one branch carries 4.0 A. What does the other branch carry?
5. In a parallel circuit, a 30. Ω branch carries 4.0 A. What is the source voltage?