AC Theory - DC Review

An electric current is defined as the flow of ? through a conductor.

• electrons

• protons

• nuclei

• ohms

The unit of electric current is the ? , which is represented by the letter ?

• ohm/R

• ampere/I

• voltage/E

• watt/W

In Ohm's law, the letter "I" represents the _________ of current flow.

• Inefficiency

• Intensity

• Opposition

• Power

The unit of electrical potential is the ? , which is represented by the letter ? .

• ampere/A

• resistance/R

• volt/V

• watt/W

Power in a circuit is the amount of work being done per unit of time

• True

• False

In Figure PP1–1, if another resistor were added to the two 30 V resistors in parallel, the total resistance of the circuit would go ? .

• Up

• Down

• Stay the same

• Alternate

Calculate total circuit current.

• 1 A

• 2 A

• 3 A

• 4 A

Calculate total circuit power.

• 120 W

• 240 W

• 480 W

• 960 W

Calculate current flow at each of the 30 $\Omega$  resistors.

• 1 A

• 2 A

• 4 A

• 6 A

Use the reciprocal formula to find the resistance of three resistors 10 ohm, 20 ohm, 30 ohms connected in parallel.

• 4.5 ohms

• 5.46 ohms

• 6 ohms

• 10 ohms