Quiz #3

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

10 A

An electric circuit has a resistance of 20 ohms. 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

NEC 240.4(D) is referred to as the "Small Conductor Rule" and tells us that the maximum overcurrent protection is 15 amperes for ____________ copper conductors.

14 AWG

The minimum lighting load requirement for dwellings is ___________volt-amperes per square foot.

3

Approx how many horsepower is an electric device listed as 3,000 watts?

4 HP

Most public service commissions require that the voltage for residential services be held to ± ____ percent of the nominal voltage as measured at the service point.

5

Wall receptacles must be placed so that no point measured horizontally along the floor line in any wall space is more than _______ feet from a receptacle outlet.

6

An electric motor is running on 120V, the current is 2A, How much resistance is in the circuit?

60

The Code specifies which rooms in a dwelling are required to have switched lighting outlets or switched receptacles. Choose yes (switch required) or no (switch not required) for the following areas: a. Yes b. No Crawl space (contains equipment that requires servicing) Attic (not intended for storage) Stairway Bathroom Hallway

A. Yes B. No A. Yes A. Yes A. Yes

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

In construction of one- and two-family dwellings, the electrical circuits are usually designed by the ____.

Electrician

List the two cases where outdoor receptacles are exempt from GFCI protection.

Exempt are receptacles that: (NEC 426.28) -are not readily accessible, -are supplied by a dedicated branch circuit -serve snow-melting or deicing equipment

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

False

Voltage flows through an electric circuit like water flows through a pipe.

False

Receptacles in unfinished basements must be ___________ protected.

GFCI

The National Electrical Code requires outdoor receptacles to be ___________.

GFCI protected

How is track lighting load in residences calculated?

It is considered to be part of the general lighting load of 3 volt-amperes per square foot

The statement, "in a D.C. Circuit, the current is directly proportional to voltage and inversely proportional to resistance," is known as ________________law.

Ohms

What determines the rating of a branch circuit?

Rating of the overcorrect device

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

Short

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 _____ circuit

closed

Which of the following is NOT included when calculating the usable area of a dwelling to compute the required lighting load?

crawl space Living room, powder rooms, unfinished basements are all included when computing the required lighting load of a dwelling

The theory concerning current flow that is most widely accepted as being correct is the _____________ electron flow theory.

electron

What standard prefix in engineering notation indicates multiplication by 1,000,000,000?

giga (G)

the neutral conductor is also referred to as the _________ conductor.

grounded

The velocity of AC through a conductor is ______________ the speed of light.

less than

Conventional curent flow theory states that current flows from the most positive point to the most ____________.

negative

The unit of resistance to current flow is the ____________.

ohm

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

resistance

Where there are six or more _____________ on an interior stairway, a wall-switch control of the stairway lighting must be provided on each floor level and any level that has an entryway.

risers

The general lighting load for a dwelling is based on the ____.

square footage of the dwelling

The amount of potential necessary to create one coulomb to produce one joule of work is a(n) ____________.

volt

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