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Name: ______________
Ch 18: Electric Current
Study Guide
Vocabulary matching: Match each vocabulary term from the word bank below to the
appropriate definition.
Ampere (A)
Potential difference
______________ Electric currents transfer ___ from one place to another.
2. ______________ Electrons flow from ____ to ___ potential.
3. ______________ ____ and generators are devices that pump electrons to an object with a higher
concentration of electrons than the original object.
4. ______________ Electric current is measured in ____.
5. ______________ Electron pumps convert various forms of energy to ____ energy.
6. ______________ A current flow of one coulomb per second is one ___.
7. ______________ _____ discovered that the ratio of the potential difference between the ends of a
wire and the current flowing through the wire is a constant.
8. ______________ The current that flows through a wire varies ____ as the applied voltage
9. ______________ The ohm is a unit of electric ____.
10. ______________ A voltmeter should be connected in ____ with the resistance in a circuit.
11. ______________ A(n) ___ measures the current flowing in a circuit.
12. ______________ Electric power is found by multiplying _____ by current.
13. ______________ The power used by a resistor is directly proportional to its resistance and to the
square of the ____ through the resistor.
14. ______________ In many materials, resistance increases when ____ rises.
15. ______________ The kilowatt hour is a unit for measuring ___.
16. ______________ The thermal energy produced in a circuit from electric energy varies directly with
the resistance, the time interval, and the square of the ____.
17. A 4.0 Ω resistor is connected to a 6.0 V battery. What is the current?
18. An iron is rated at 1680 W and is connected to a 120.0 V outlet. Calculate the current that the
iron draws.
19. A 60.0 W light bulb is connected to a 120.0 V outlet. What is the resistance of the bulb?
20. A car battery causes a current of 2.0 A through a lamp that produces 12 V across it. What is the
power used by the lamp?
21. A motor with an operating resistance of 32 Ω is connected to a voltage source. The current in the
circuit is 3.8 A. What is the voltage of the source?
22. A current of 1.82 A flows through a copper wire 1.75 m long and 1.10 mm in diameter. Find the
potential difference between the ends of the wire.