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37 terms

Chapter 7

STUDY
PLAY
A circuit that has two or more separate branches for current is a ____.
parallel circuit
The statement, current is equal to the voltage difference divided by the resistance, is known as
Ohm's law
A static discharge differs from an electric current in that a static discharge ____.
lasts for only a fraction of a second
Electric charge that has accumulated on an object is referred to as ____.
static electricity
Resistance is measured in a unit called the ____.
ohm
The rate at which an electrical device converts energy from one form to another is called
electrical power
Which of the following is the correct relationship among power, current, and voltage?
P = I x V
A television that requires an average of 0.40 ampere of current is operated on a 120-volt service for 5.0 hours. How much energy is used?
0.24 kWh
One source of constant electric current is a ____.
dry cell
A material through which electrons do not move easily is a(n) ____.
insulator
Lightning is ____.
a very large discharge of static electricity
The voltage ____ as current moves through a circuit.
varies
Which of the following is a device designed to open an overloaded circuit and prevent overheating?
circuit breaker
If a current flowing through a lightbulb is 0.75 ampere and the voltage difference across the lightbulb is 120 volts, how much resistance does the light bulb have?
160 ohms
If an air conditioner uses 1800 watts of power when plugged into a wall socket that operates at a voltage of 210 volts, what is the current flowing through the air conditioner?
8.57 amps
allows electrons to move through it easily
conductor
closed path through which electrons flow
circuit
accumulation of electric charges on an object
static electricity
circuit with more than one path
parallel circuit
tendency of a material to oppose electron flow
resistance
does not allow electricity to move through it easily
insulator
push that causes charges to move
voltage difference
Surrounds electric charge and exerts force on other charges.
electric field
rate at which electrical energy is changed to another energy form
electric power
flow of electrons through a conductor
electric current
circuit with only one path
series
unit of electrical energy
kilowatt hour
Current is equal to the voltage difference of a circuit divided by its resistance.
Ohm's law
car battery type
wet cell
metal rod that directs lightning to Earth
lightning rod
device that detects electric charges
electroscope
AAA - D battery type
dry cell
how much power an applience uses
kWh
a small piece of wire that melts to prevent electical fire
fuse
a piece of metal that bends to prevent electrical fire
breaker
no current flows in this type of circuit
open
If the battery is a 9-volt battery and the resistance in the circuit is 18 ohms, how much current is flowing through the circuit? (I = V/R)
0.5A