Exam 12: Basic Electricity and Magnetism

As loads are added in a parallel circuit, the total resistance of the circuit ____.

What are the three types of opposition to current flow that impedance represents?

An element in an electric heating unit is connected to a 232-V power supply. The current flow through the element is 19 A. What is the resistance of the element ?

If three bulbs are wired in parallel and one bulb burns out, the total current of the circuit will decrease.

Write the three forms of Ohm's Law.

The main purpose of a rectifier is to convert direct current (DC) to alternating current (AC).

The unit of measure for the current flow of electrical energy is the ____________________.

The unit of measure for the electrical pressure forcing electrical energy through a conductor is the ____________________.

Three electric heating elements are connected in parallel with each other and each element draws 7 A. The supply voltage is 210 V . a) What is the resistance of each heater? b) What would the current be through each of the two remaining heaters if one heater burns out?

A good conductor of electricity has  few ____________________ electrons which can move easily from one atom to another.

Describe inductance.

When checking a diode with an ohmmeter and the meter shows a resistance, if the meter leads are reversed, it should show infinity .

Why is rubber a good insulator?

What part of an atom moves from one atom to another?

Ohmmeters are to be used only on circuits that are de-energized.

What is the difference between AC and DC current?

If ten 60-W light bulbs are wired in parallel with each other and are connected to a 120-V power supply, what will a voltmeter read if connected across any one bulb ?

To find the watts of electrical power in an electrical circuit, you multiply ____  together .

If a conductor carrying electrical current is formed into a coil, the magnetic field around the wire will ____.

____________________ are used to measure the intensity of current flow in a circuit or a particular branch in a circuit, so they are wired in series with the circuit being evaluated.