Understanding Electric Circuits

What is the unit of electric charge?

• Ohm

• Volt

• Coulomb

• Watt

Which of the following best describes static electricity?

• A type of electrical circuit that is always on.

• A flow of electric current through a conductor.

• The process of charging a battery.

• An imbalance of electric charges on a surface.

In a series circuit with two bulbs, if one bulb goes out, what happens to the other bulb?

• The other bulb goes out.

• The other bulb dims but does not go out.

• The other bulb flickers but remains on.

• The other bulb stays lit.

What is the purpose of a resistor in a circuit?

• To increase current flow in a circuit.

• To limit current and control voltage in a circuit.

• To store electrical energy for later use.

• To convert electrical energy into heat.

If the voltage in a circuit is 12 V and the resistance is 4 Ω, what is the current flowing through the circuit? (Use Ohm’s Law, V=I×R)

• 6 A

• 4 A

• 2 A

• 3 A

Which instrument would you use to measure the voltage across a component in a circuit?

• Multimeter

• Ohmmeter

• Ammeter

• Voltmeter

If a circuit has a total voltage of 9 V and three resistors with equal resistance, what is the voltage across each resistor?

• 1 V

• 4 V

• 3 V

• 6 V

What is the relationship between voltage, current, and resistance called?

• Ohm's Law

• Faraday's Law

• Kirchhoff's Law

• Newton's Law of Cooling

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

• The total resistance increases.

• The total resistance remains the same.

• The total resistance becomes infinite.

• The total resistance decreases.

What is the function of a capacitor in a circuit?

• To convert AC to DC voltage.

• To act as a resistor in a circuit.

• The function of a capacitor in a circuit is to store and release electrical energy.

• To amplify electrical signals in a circuit.