Chapter 23 Electricity Study Guide
What is the power of a device that uses 10 amps of current in a 120-volt circuit?
1.2 kilowatt
Assume that a wire has 1.5 ohms of resistance. If the wire is connected to two 1.5-volt batteries, how much current will flow through the wire?
2.0 amps
Most home circuits can carry a maximum current of about
30 amps
Copper electrical wires have a plastic coating because
all of the above
If you rub a piece of wool cloth on a balloon, friction causes the
all of the above
Which type of electronic component contains semiconductors?
all of the above
Electric current that keeps reversing direction is called __________.
alternating current
The SI unit for electric current is the
ampere
An electronic signal created by a continuous change in voltage is a(n) __________ signal.
analog
Which statement applies to a binary code?
based on 0 and 1
Static electricity occurs whenever
charges build up on an object.
An electronic signal created by pulses of voltage is a(n) ________ signal.
digital
An electronic component consisting of just two semiconductors is a(n) __________.
diode
The force of attraction or repulsion between charged particles is known as __________.
electric force
Which statement about the electrodes in a battery is false?
electrodes are either a paste of liquid
The use of electric current to encode information is called __________.
electronics
A battery with six electrodes contains six chemical cells.
false
A diode can be used as a switch in an electric circuit.
false
All electric circuits must include a voltage source and a switch.
false
Any device that uses electric current is an electronic device.
false
Electric current can travel through matter or across space.
false
Electrical energy use is a product of current and time.
false
Greater resistance always results in more current.
false
Polarization is the transfer of electrons between oppositely charged objects.
false
The ground beneath a storm cloud becomes positively charged by conduction.
false
The law of conservation of charge states that charges cannot move without being destroyed.
false
The role of the ROM microchip in a computer is to provide temporary storage.
false
The transfer of electrons that occurs when one object rubs on another is called __________.
friction
A material that has high resistance to the flow of electric current is called an electric __________
insulator
Which units are used to measure electrical energy use?
kilowatt-hours
Cations form when atoms __________ electrons.
lose
Integrated circuits are commonly known as
microchips
Which of the following electric devices uses electric current to encode information?
microphone
Both lightning bolts and electric current occur because of
moving electric charges.
Electric field lines around a positively charged particle
point away from the particle.
What does voltage mean?
potential difference
Electric current flows through a wire only if there is a difference in electric __________.
potential energy
The source of voltage in home electric circuits is a(n)
power plant
Two negatively charged particles always __________ each other.
repel
Opposition to the flow of electric current is known as _____
resistance
A(n) __________ is a crystal that conducts current better than an insulator but not as well as a conductor.
semiconductor
________ is the sudden flow of electrons from an object that has a buildup of charges.
static discharge
Which of the following statements about n-type semiconductors is true?
they are like negative terminal of chemical cell
The movement of air molecules, water droplets, and ice particles inside a cloud causes the
transfer of electric charges within the cloud.
A charged particle exerts force over a distance because the particle has an electric field.
true
A damaged electric cord can cause an electric short.
true
A transistor can be used to increase the amount of current in a circuit.
true
An electric generator changes kinetic energy to electrical energy.
true
Electric current is a continuous flow of electric charges.
true
GFCI outlets are used in kitchens and bathrooms.
true
Water is a very good electrical conductor.
true
When you touch a van de Graaff generator, electrons flow to you from the device.
true
__T___ 9. DVDs use digital signals to encode sounds and pictures.
true
A battery that contains a liquid electrolyte is referred to as a(n) _________.
wet cell