Electric Current and Ohm's Law

Current flow requires a(n) --- and a(n) ---.

• potential difference / circuit breaker

• static charge / switch

• solar cell / generator

• potential difference / closed path

Electric current is calculated by ---.

• dividing charge by time

• multiplying potential difference by charge

• dividing work by charge

• multiplying power by potential difference

As current flows, ---.

• the electric charge gets used up and evaporates by the time the other terminal of the battery is reached

• the electric charge builds up on circuit elements like light bulbs until the switch is opened

• the electric charge loses potential energy as it flows through each circuit element

• the electric charge slows down as it moves through each circuit element

"Voltage" is a common term for ---.

• potential difference

• current

• charge

• electric potential energy

A current of 0.050 A that flows through a light bulb for 40 s means --- electric charge passed through.

• 2.0 C

• 800 C

• 0.00125 C

• 0.050 C

--- is measured in ohms (Ω).

• Current

• Power

• Resistance

• Potential difference

What size resistor would produce a 3 amp current flow with a 12 volt battery?

• 1 Ohm

• 3 Ohms

• 4 Ohms

• 12 Ohms

Current times resistance equals ---.

(I×R)

• power

• voltage

• amperage

• ohm

Which of the following represents the rate of the flow of electricity, expressed in unit of amps?

• current

• circuit

• voltage

• resistance

How does resistance affect current?

• less resistance - less current
• more resistance - less current
• more resistance - more current
• resistance does not affect current