Electricity AQA Quiz

What is the unit of electric current?

• B

• C

• D

• A

According to Ohm's law, what is the relationship between voltage, current, and resistance?

• V = I * R

• V = I / R

• V = I ^ R

• V = I + R

In a series circuit, how does the total resistance compare to the individual resistances?

• The total resistance is unrelated to the individual resistances.

• The total resistance is equal to the sum of the individual resistances.

• The total resistance is greater than the sum of the individual resistances.

• The total resistance is less than the sum of the individual resistances.

What is the formula to calculate electrical power?

• P = V - I

• P = V * I

• P = V / I

• P = V + I

Why is it important to use circuit breakers and fuses in electrical circuits?

• To make the circuits more aesthetically pleasing

• To increase the electrical resistance

• To protect the electrical circuits from overloads and short circuits.

• To make the circuits more colorful

What happens to the total resistance in a parallel circuit as more resistors are added?

• The total resistance decreases

• The total resistance increases

• The total resistance stays the same

• The total resistance becomes negative

What is the purpose of grounding electrical appliances?

• To prevent electric shock and reduce the risk of electrical fires.

• To make appliances more dangerous

• To save energy

• To increase the risk of electrical fires

How does increasing the voltage affect the current in a circuit, according to Ohm's law?

• The current will increase

• The current will remain the same

• The current will decrease

• The current will become negative

What are the safety precautions to be taken when working with electrical appliances?

• Wear metal jewelry while working with electrical appliances

• Use wet hands when handling electrical appliances

• Use insulated tools, wear protective gear, unplug appliances before servicing, and avoid working on electrical appliances in wet conditions.

• Service electrical appliances while they are still plugged in

Explain the difference between AC and DC electricity.

• AC electricity is used for electronic devices, while DC electricity is used for household appliances.

• AC electricity flows in one direction, while DC electricity periodically reverses direction.

• AC electricity is more dangerous than DC electricity.

• AC electricity periodically reverses direction, while DC electricity flows in only one direction.