NCCER Ch 3 Review

An electrical circuit contains, at minimum, a(n) ________.

• voltage source, load, and overcurrent device

• ammeter, load, and voltage source

• voltage source, load, and conductors

• conductor, switch, and load

A type of subatomic particle with a positive charge is a(n) ________.

• proton

• neutron

• electron

• nucleus

Which of the following substances is considered an insulator?

• Gold

• Copper

The voltage commonly supplied to a residence by the local utility is

• 120V

• 240V

• 480V

• 208V

Current is measured in units called

• joules

• coulombs

• amperes

• volt-amperes

Joules are

• units of work

• the potential difference between two points

• the difference between EMF and current

• the rate of current flow

Another term used for voltage is

All conductors have

• current flow

• some resistance

• EMF

• voltage potential

In order to calculate the current flowing in a circuit

• multiply voltage by resistance (EX R)

• divide resistance by power (R/P)

• multiply power by resistance (P x R)

• divide voltage by resistance (E/R)

The color band that represents tolerance on a resistor is the

• 4th band

• 3rd band

• 2nd band

• 1st band