Unit 12

What type of charge does an electron have?

• Negative
• Positive
• Neutral
• Negative-positive.

If five electrons combine with three protons, the net charge will be ____.

• Negative
• Positive
• zero
• Negative-positive.

What part of an atom moves from one atom to another?

• Electron
• Neutron
• Proton
• Molecule

Typical insulators are: ____.

• glass, rubber, plastic
• copper, silver, gold
• steel, bronze, brass
• aluminum, nickel, magnesium

The ampere is ____.

• a measure of the quantity of electrons flowing past a point in the electrical circuit in a given time
• the difference in potential between two charges
• the unit of measure for resistance
• the unit of measure for capacitance

If two light bulbs are wired in series and one bulb burns out, the other bulb will ____.

• go out
• stay on
• stay on, but it will be dimmer
• stay on, but it will be brighter

What happens to the current in a circuit if the resistance is increased?

• The current decreases.
• The current increases.
• The current remains the same.
• This cannot be determined.

An element in an electric heating unit is connected to a 232-V power supply. The current flow through the element is 19 A. What is the resistance of the element?

• 12 Ω
• 8 Ω
• 10 Ω
• 14 Ω

As loads are added in a parallel circuit, the total resistance of the circuit ____.

• will decrease
• will increase
• will remain the same
• cannot be determined

To find the watts of electrical power in an electrical circuit, you multiply ____ together.

• volts and amperes
• ohms and amperes
• ohms and volts
• volts, amperes, and ohms