T2W8 - Current & Ohms Law

Current is best defined as

• Electricity

• The flow of charge over a period of time

• The movement of electrons

• Energy moving from positive to negative

Current is measured in ...

• Amps (A)

• Volts (V)

• Coulombs (C)

• Ohms ( $\Omega$  )

Resistance is best defined as ...

• The push allowing current to flow

• The flow of electrons

• A toaster producing heat

• The restriction of current flow

The unit for resistance is...

• Amps (A)

• Volts (V)

• Coulombs (C)

• Ohms ( $\Omega$ )

Conventional current is...

• The flow of charge from negative to positive

• The flow of electrons

• The flow of charge from positive to negative

• The flow of positive charges

A charge of 12 coulombs passes through a conductor in 60 seconds. What is the current?

• 0.2 A

• 2.0 A

• 0.02 A

• 0.2 V

 $2.4\times10^{22\ }$  electrons flow through a wire in 100 seconds, what current is passing through the wire?

•  $2.4\times10^{20}$  A

• 3840 A

• 3.84 V

• 38.4 A

Identify Ohm's Law

• $I=\frac{Q}{t}$

• $V=IR$

• $V=A\Omega$

• $R=IV$

A current of 2 amperes is measured passing through a 625 ohm resistor. What is the voltage across the resistor?

• 312.5 V

• 1250 V

• 625 V

• 625 A

What is the current if the voltage across a 400 $\Omega$  resistor is 480 volts?

• 1.2 A

• 1920 A

• 12 A

• 192000 A