Charge, current and time

What is the equation that links charge (Q), current (I) and time (t)?

• Charge = Current x Time, or Q=It

• Charge = Current / Time, or Q=I/t

• Charge = Time / Current, or Q=t/I

What is charge measured in?

• Electrons

• Current

• Ohms

• Coulombs

Complete the equation: Charge = ................ x ..............

• Time, Current

• Current , Voltage

• Resistance, Voltage

• Current , Time

Calculate the charge and give the unit when a current of 0.15 A flow around the circuit for 20 seconds.

• 133.33 C

• 1.5 C

• 0.0075 C

• 3 C

Why must parts of a circuit be properly connected before the bulb can light up?

• To ensure that the bulb can light up.

• To ensure that the battery can produce light in a closed circuit.

• To ensure that electric current can flow through the closed circuit.

What is the definition of electrical current?

• The opposition to the flow of electrons

• The rate of flow of charge

• The work done on each coulomb of charge

• Electrons moving around

Current flows through a wire for 3.5 minutes. How many seconds is this?

• 150

• 190

• 210

• 305

The current in a wire is 1.2kA. What is the current in Amps?

• 120A

• 12A

• 0.12A

• 1200A

How much charge flows through a wire in 80s if the current is a constant 5.4A?

• 432C

• 360C

• 524C

• 344C

The total charge that flows though a wire in 25s is 1kC. What is the average current through the wire?

• 20,000A

• 0.04A

• 40A

• 25A