Multiple Choice
19.1 Ohm's law
The equivalent unit for an ohm is a ________.
- V/A
- C/m
- V/s
19.2 Series Circuits
What does the circuit element shown represent?
- a battery
- a capacitor
- the ground
- a switch
How many 10-Ω resistors must be connected in series to make an equivalent resistance of 80 Ω?
- 80
- 8
- 20
- 40
Which two circuit elements are represented in the circuit diagram?
- a battery connected in series with an inductor
- a capacitor connected in series with a resistor
- a resistor connected in series with a battery
- an inductor connected in series with a resistor
How much current will flow through a 10-V battery with a 100-Ω resistor connected across its terminals?
- 0.1 A
- 1.0 A
- 0
- 1,000 A
19.3 Parallel Circuits
A 10-Ω resistor is connected in parallel to another resistor R . The equivalent resistance of the pair is 8 Ω. What is the resistance R?
- 10 Ω
- 20 Ω
- 30 Ω
- 40 Ω
Are the resistors shown connected in parallel or in series? Explain.
- The resistors are connected in parallel because the same current flows through all three resistors.
- The resistors are connected in parallel because different current flows through all three resistors.
- The resistors are connected in series because the same current flows through all three resistors.
- The resistors are connected in series because different current flows through all three resistors.
19.4 Electric Power
What power is dissipated in a circuit through which 0.12 A flows across a potential drop of 3.0 V?
- 0.36 W
- 0.011 W
- 5 V
- 2.5 W