MODULE 3 ELECTRICAL

What term describes electromotive force?

Voltage

What is voltage?

The driving force that pushes current through a circuit

What symbol represents voltage?

E

What unit is voltage measured in?

Volts (V)

What tool is used to measure resistance?

Ohmmeter

What device measures voltage, current, and resistance?

Multimeter (VOM)

Why must power be off when using an ohmmeter?

It has its own battery

What does continuity mean?

A complete path for current flow

What does infinite resistance mean?

An open circuit (no continuity)

In a parallel circuit, what happens to voltage?

It is the same across all loads

In a parallel circuit, what happens to current?

It is divided between loads

What is true about total resistance in a parallel circuit?

It is less than the smallest resistor

What does an electron repel?

Other electrons (like charges)

What does the law of charges state?

Like charges repel and unlike charges attract

What device creates voltage chemically?

Battery

What is Ohm’s Law for resistance?

R = E / I

What is Ohm’s Law for current?

I = E / R

What is Ohm’s Law for voltage?

E = I × R

Which materials are semiconductors?

Silicon and germanium

Give examples of conductors

Copper and silver

Give examples of insulators

Plastic and porcelain

What device is used to step up voltage?

Transformer

How is current measured with an inline meter?

It must be connected in series

If two 5Ω resistors are in series, what is total resistance?

10 ohms

What is another name for magnetic lines of force?

Magnetic flux lines

What does a silver resistor band indicate?

±10% tolerance

What is the definition of voltage?

The difference in electrical potential between two points

What is the power formula?

P = I × E

What is the unit of power?

Watts (W)

What is 1 kilowatt equal to?

1000 watts

What is a joule?

A unit of electrical work

What is 1 watt?

1 joule per second

What is the formula to find voltage from power?

E = P / I

What is the formula to find current from power?

I = P / E

If R = 20Ω and I = 15A, what is power?

4500W

If E = 120V and I = 10A, what is power?

1200W

If R = 5Ω and I = 5A, what is power?

125W

If E = 120V and R = 10Ω, what is current?

12A

If I = 48A and R = 10Ω, what is voltage?

480V

If E = 240V and I = 20A, what is resistance?

12Ω

If 100Ω and 150Ω are in parallel, what is total resistance?

60Ω