Electricity Quiz

What is the purpose of a switch in an electric circuit?

• 
• To play music

• To cook food

• To open or close the circuit

Explain the difference between an open circuit and a closed circuit.

• An open circuit allows the flow of electricity, while a closed circuit does not.

• An open circuit has a switch, while a closed circuit does not.

• An open circuit has a broken wire, while a closed circuit does not.

• An open circuit does not allow the flow of electricity, while a closed circuit does.

How does the addition of more resistors affect the total resistance in a series circuit?

• The total resistance increases

• The total resistance decreases

• The total resistance remains the same

• The total resistance becomes zero

State Ohm's law and explain its significance in electrical circuits.

• Ohm's law states that the voltage across a conductor is directly proportional to the resistance of the conductor.

• Ohm's law states that the current through a conductor is inversely proportional to the voltage across the two points.

• Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points.

• Ohm's law states that the resistance of a conductor is not affected by the voltage across the two points.

If the voltage across a resistor is 12 volts and the current flowing through it is 3 amperes, what is the resistance of the resistor?

• 10 ohms

• 2 ohms

• 6 ohms

• 4 ohms

A wire has a resistance of 4 ohms. If a current of 2 amperes flows through it, what is the voltage across the wire?

• 6 volts

• 10 volts

• 8 volts

• 3 volts

Compare the resistance in a series circuit with the resistance in a parallel circuit.

• The resistance in a series circuit is less than the resistance in a parallel circuit.

• The resistance in a series circuit is the same as the resistance in a parallel circuit.

• The resistance in a series circuit is greater than the resistance in a parallel circuit.

• The resistance in a series circuit is not related to the resistance in a parallel circuit.

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

• Total resistance decreases

• Total resistance becomes zero

• Total resistance stays the same

• Total resistance increases

Explain the importance of using insulated tools and wearing rubber gloves when working with electricity.

• To keep the tools warm

• To improve grip on the tools

• To look professional

• To protect against electric shock and potential injury.