Appliance Repair Electrical Theory Learning Quiz

Introduction

This quiz is designed to help Appliance technicians learn, test their knowledge, or just provide a review of their existing knowledge of electrical theory as it applies to appliance repair. Each question will have an associated answer – helping solidify your knowledge of electricity. So let’s test your knowledge.

How Many Questions can you Get Right?

Appliance repair electricity quiz - The Tech Circuit — Appliance repair electricity quiz – The Tech Circuit

Question – What is voltage?

What is voltage ? Appliance repair electricity quiz - The Tech Circuit — What is voltage ? Appliance repair electricity quiz – The Tech Circuit

Voltage is the force or pressure that causes current to flow through a wire.

Question – What is Current?

Current is the rate of flow of electrons through a wire.

Question – What is true of voltage in current?

Voltage is a potential difference between two points that causes current to flow.

Question – What does the height of the water in the water analogy represent?

The height of the water in the water analogy represents voltage.

Question – What does the rate of flow of water in the water analogy represent?

The rate of flow of water in the water analogy represents current.

Question – What does the bottleneck in the water analogy represent?

The bottleneck and the water analogy represents resistance.

Question – In a circuit with more than one resistor in series how does voltage behave?

In a circuit with more than one resistor in series the sum of the voltages across each resistor adds up to the supply voltage.

Question – In a series circuit with two resistors which resistor has the greatest share of voltage across it?

In a series circuit with two resistors the highest resistor value has the greatest share of voltage across it.

Question – How does current behave in a series circuit?

Current remains the same through the entire circuit. — Current remains the same to the entire circuit.

Question – In a circuit with more than one resistor in series how does current behave?

In a circuit with more than one resistor in series the current is the same through each resistor.

Question – In a circuit with more than one resistor in parallel how does current behave?

In a circuit with more than one resistor in parallel the current through each resistor depends on their resistance.

Question – What is the usefulness of a LoZ meter?

The usefulness of a LoZ meter is all of the above.

Question – What is wattage or power?

Question – If you have 240 volts across A10 ohm element how much current flows through that element?

Use ohm's law to determine how much current flows through the element. — Use ohm’s law to determine how much current flows through the element.

240 volts across A10 ohm element causes 24 amps of current to flow through it.

Question – Use Joule’s law to determine the wattage of the heating element.

If you double the voltage across a resistive load such as a heating element, per joules law. You will quadruple the wattage. The answer is 5760 watts.

Question – Normally a 24 ohm bake element produces 2400 watts of heat at 240 volts if for any reason only 120 volts appeared across that element how many watts of heat will it produce?

Normally a 24 ohm bake element produces 2400 watts of heat at 240 volts if for any reason only 120 volts appeared across that element how many watts of heat will it produce?

Use Joule's law to determine the wattage. — Use Joule’s law to determine the wattage.

Because power is exponential for a given resistance, the power output at 120 volts will be reduced to 1/4 of the original or 600 watts.

Question – How might this damaged cord affect a 240 Volt heat circuit?

Question – What is the best reference to connect one lead of your voltmeter to when using voltage differences on a 240 Volt circuit?

The best reference is L1 or L2. Neutral is not part of that circuit.

Question – Why should you avoid using neutral ground as a reference when troubleshooting to a 240 Volt circuit?

Question – What is the best reference to connect one lead of your voltmeter to when diagnosing using voltage differences on 120 Volt circuit?

The best reference for 120 Volt circuit troubleshooting is neutral.

Question – If you have a 240 Volt dryer but want to use the voltage difference method to check the motor circuit what is the best terminal to reference at the terminal block?

If you have a 240 Volt dryer but want to use the voltage difference method to check the motor circuit what is the best terminal to reference at the terminal block?

The best reference point for 120 Volt appliance troubleshooting is neutral. — The answer is neutral.

Question – What is one of the few instances when ground would be used as a reference when troubleshooting?

One of the few instances when ground would be used as a reference when appliance troubleshooting would be when checking for a floating neutral.

Question – Why should ground and neutral be electrically separated at the terminal block with a four wire cord?

Ground and neutral should be separated because they are intended to be part of separate circuits, ground should not carry current on a regular basis, and it minimizes the chance that the enclosure will become energized or alive. — The answer is all the above.

Conclusion

How did you do? If you want to sharpen your electrical theory skills re-do the questions you got wrong, until you score 100%. Learning and maintaining your knowledge of electrical theory is a never-ending process. Stay on top of your game. Be in the 100% club.

Don’t forget:
“Diverting 10 min/day of social media time towards learning something new, is 5 hours of newfound monthly knowledge.” – SM

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