unit 12

What type of charge does an electron have?

• positive

• negative

• neutral

• negative-positive

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

• negative

• positive

• random

• neutral

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

• proton

• neutron

• electron

• molecule

Typical insulators are ____.

• copper, silver, gold

• steel, bronze, brass

• glass, rubber, plastic

• aluminum, nickel, magnesium

An ampere is ____.

• the difference in potential between two charges

• a measure of the quantity of electrons flowing past a point in the electrical circuit in a given time

• 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 remains the same.

• The current increases.

• The current decreases.

• This cannot be determined.

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

• 8 ohms

• 10 ohms

• 12 ohms

• 14 ohms

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

• will increase

• will decrease

• will remain the same

• cannot be determined

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

• ohms and amperes

• ohms and volts

• volts and amperes

• volts, amperes, and ohms