Understanding Electric Circuits and Efficiency

Which of the following is the correct symbol for electric current?

What is the SI unit for measuring electric potential difference?

• Ampere

• Ohm

• Volt

• Watt

Which component in a direct current (dc) circuit is responsible for providing energy to the circuit?

• Resistor

• Switch

• Battery

• Light bulb

What is the function of a resistor in a dc circuit?

• To increase the current

• To store electrical energy

• To limit the flow of electric current

• To convert electrical energy to chemical energy

Which of the following is the correct SI unit for resistance?

• Ampere

• Ohm

• Volt

• Watt

Which symbol is commonly used to represent a battery in a circuit diagram?

• A zigzag line

• Two parallel lines, one longer than the other

• A circle with a cross inside

• A rectangle

If the resistance in a circuit increases while the potential difference remains the same, what happens to the current?

• It increases

• It decreases

• It stays the same

• It becomes zero

Which graph best represents the relationship between current and potential difference in a resistor, according to Ohm’s Law?

• A straight line through the origin

• A horizontal line

• A curve that increases then decreases

• A vertical line