Chapter 8

In electrical systems, the volume of electrons that move through a conductor is called the "circuit _____."

intensity

When using clamp-on ammeters, separate conductors under test from other surrounding conductors by a few _____ whenever possible.

Inches

An "ampere" is the number of electrons passing a given point in _____ second(s).

One

"_____" is a condition that exists in an electrical circuit when the normal load current is exceeded.

Overcurrent

Power is not equal to E x I for ac circuits because consideration must be given to inductive reactance.

True

Smaller conductors have greater resistance and larger conductors have lower resistance.

True

The work that can be performed by the moving electrons dependents on the circuit pressure and the circuit's opposition to the flow of electrons.

True

Care is required to protect the _____ when measuring alternating current or direct current with an in-line ammeter.

User, Circuit, Ammeter

Both clamp-on ammeters and DMMs with a clamp-on current probe accessory are commonly used to measure currents from _____.

1.00A (or less) to 3,000A

Most DMMs have fuses that become part of the current-measuring _____.

Circuit

A "clamp-on ammeter" is a meter that measures _____ in a circuit by measuring the strength of the magnetic field around a single conductor.

Current

Electrical pressure is called "_____," and it is measured in Volts.

EMF, Potential

"Current" is the amount of _____ flowing through an electrical circuit.

Electrons

Aluminum has a lower resistance to the flow of electrons than does copper.

False

Every component of an electrical circuit contains resistance, except the power supply.

False

"_____" is defined as the rate of work measured by the unit called the watt.

Power

According to the Conventional Current Flow Theory, a positive charge flows from positive to negative in the circuit.

True

According to the Electron Current Flow Theory, electrons flow away from the negative terminal of the source, through the circuit and load, toward the positive terminal of the source.

True

DC power is determined by multiplying the electromotive force by the circuit intensity.

True

The advantage of a clamp-on ammeter or a DMM with a clamp-on current probe accessory is that readings can be taken more _____ without opening or interrupting the circuit.

safely

Knowing the current measurement in a system, component, circuit, or part of a circuit is very useful when _____.

troubleshooting