Charge (Q) and current (I)

What is the symbol for electric current?

• I

• V

• R

• Q

What is the unit of electric current?

• Ampere, amp (A)

• Volt (V)

• Ohm (Ω)

• Watt (W)

What is the relationship between charge (Q), current (I), and time (t)?

• I = Q / t

• I = t / Q

• Q = I / t

• t = Q / I

Which instrument is used to measure electric current in a circuit?

• Ammeter

• Voltmeter

• Barometer

• Thermometer

Match the following glossary terms with their correct definitions:

• A device used to measure electric current

• Electron

• A source of electrical energy

• Ammeter

• A negatively charged subatomic particle

• Battery

Name the small, negatively charged component of an atom.

• Electron

• Proton

• Neutron

• Nucleus

Complete the following sentence. Positive charge repels ______________ charge and attracts ______________ charge. It is said that 'like charges ______________ and opposite (or unlike) charges ______________.'

• Positive charge repels positive charge and attracts negative charge. It is said that 'like charges repel and opposite (or unlike) charges attract.'

• Positive charge repels negative charge and attracts positive charge. It is said that 'like charges attract and opposite (or unlike) charges repel.'

• Positive charge repels both positive and negative charges. It is said that 'like charges attract and opposite (or unlike) charges attract.'

• Positive charge attracts both positive and negative charges. It is said that 'like charges repel and opposite (or unlike) charges repel.'

What is the function of a battery in an electric circuit?

• It converts electrical energy to thermal energy

• It supplies or stores electrical energy

• It acts as a conductor

• It increases resistance

Fill in the blank: In a simple electric circuit, the ______ converts electrical energy to another form of energy, such as thermal energy.

• load

• switch

• wire

• battery

What is the net flow of electric charge, measured in amperes (A), where 1 A = 1 C s⁻¹, called?

• Current

• Voltage

• Resistance

• Power