7.1 Voltage, Current, and Resistance

What are the two conditions that must be met for electric charge to continue to move?

• The charge must be static.

• There must be an energy source.

• There must be a complete path for the charge to flow.

• The circuit must be open.

What is the role of a switch in an electric circuit?

• It converts electrical energy to another form of energy.

• It provides a path for the electric charge to flow.

• It turns the circuit on or off by closing or opening the circuit.

• It generates current electrical energy.

Which of the following is an example of an electrical load?

• A light switch

• A conducting wire

• A light bulb

• An energy source

What is the SI unit for measuring voltage?

• Ampere (A)

• Volt (V)

• Ohm (Ω)

• Watt (W)

What is voltage in an electrical circuit?

• The flow of electrons through the conductor

• The difference in electrical energy between two points in a circuit

• The total amount of electrons in a circuit

• The resistance to the flow of electrons

Which instrument is used to measure voltage?

• Ammeter

• Voltmeter

• Ohmmeter

• Wattmeter

What happens when the voltage in a circuit is higher?

• The resistance to electron flow decreases

• The stored electrical energy provided to each electron is less

• The stored electrical energy provided to each electron is greater

• The difference in electrical energy between two points is eliminated

What happens when an energy source is connected to a circuit, in terms of electron movement?

• The electrons move from the switch to the light bulb.

• The electrons in the conductor instantly push or repel other electrons.

• The electrons wait for a signal before moving.

• The electrons move one by one from the energy source to the device.

What instrument is used to measure the current in a circuit?

• Voltmeter

• Ammeter

• Ohmmeter

• Wattmeter

What is the unit of electric current?

• Volt (V)

• Watt (W)

• Ampere (A)

• Ohm (Ω)