DEL Unit 02: Electrical Quantities and Ohm's Law

An electrical circuit has a voltage of 50 V and a resistance of 5 Ω. What is the value of current?

10A

An electric circuit has a resistance of 20 Ω. The current is measured to be 6 A. How many volts are applied to the circuit?

120

A toaster is listed as 1560 W. When it is plugged into a 120 V circuit and starts to make toast, how many amperes will it draw?

13

Approximately how many horsepower is an electrical device that is listed as 3,000 watts? 1/4

4

An electric motor is running on 120 V. The current is measured to be 2 A. How many ohms of resistance is the motor?

60

What law states that the force of electrostatic attraction or repulsion is directly proportional to the product of the two charges and inversely proportional to the square of the distance between them?

Coulomb's Law

During normal operation of a typical 120-volt appliance circuit, current flows through the hot, grounding, and neutral conductors.

False

On the Ohm's law chart, what do you use to find current when power and voltage are known?

I = P/E

On the Ohm's law chart, what do you use to find power when current and voltage are known?

P = E*I

A grounding conductor helps prevent a shock hazard in the event that an ungrounded, or hot, conductor comes in contact with the case or frame of an appliance.

True

The grounding prong of a plug should never be cut off or bypassed.

True

One coulomb per second is equal to one _____

ampere

A complete circuit is often referred to as a(n) _____ circuit.

closed

The neutral conductor is also referred to as the _____ conductor.

grounded

The unit of resistance to current flow is the _____.

ohm

What causes a wire to become warm when current flows through it?

resistance

What type of circuit generally occurs when the conductors leading from and back to the power source become connected?

short

What is another term for electromotive force (EMF)?

voltage

The amount of electrical power being used in a circuit is measured in ____.

watts

If a circuit is open, current _____ flow.

will not