Electric Circuits and Components Quiz

Which of the following statements best describes the difference between series and parallel circuits in terms of current and voltage?

• In series circuits, current is shared and voltage is equal across each component; in parallel circuits, current is equal and voltage is shared.

• In series circuits, current is equal everywhere and voltage is shared; in parallel circuits, current is shared and voltage is equal across each component.

• In both series and parallel circuits, current and voltage are equal everywhere.

• In series circuits, both current and voltage are shared; in parallel circuits, both are equal.

What is the correct symbol for a resistor in an electrical circuit diagram?

• A zigzag line

• A circle with a cross inside

• A straight line with a break in the middle

• A triangle pointing to a line

If you want to measure the current in a circuit, how should you connect the ammeter?

• In parallel with the component

• In series with the component

• Next to the power supply

• Across the battery terminals

Which equation correctly represents the calculation of power in an electrical circuit?

• Power = Voltage × Resistance

• Power = Voltage ÷ Current

• Power = Voltage × Current

• Power = Current ÷ Voltage

How does the resistance of a thermistor change with temperature?

• Resistance increases as temperature increases

• Resistance decreases as temperature increases

• Resistance stays the same regardless of temperature

• Resistance fluctuates randomly with temperature

A student wants to investigate how current changes with voltage for a bulb. What should they do to obtain a series of values?

• Change the bulb each time

• Adjust the variable resistor and record new values each time

• Use a different power supply for each measurement

• Only measure once and use the same value repeatedly

Which of the following best explains the behavior of a filament lamp as shown in its current-voltage graph?

• The resistance remains constant at all voltages

• The resistance decreases as voltage increases

• The resistance increases at higher voltages

• The current stops flowing at higher voltages

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

• The total resistance increases

• The total resistance stays the same

• The total resistance decreases

• The total resistance doubles

Why do LDRs (Light Dependent Resistors) have lower resistance in brighter light?

• Because higher light levels increase temperature

• Because brighter light allows more current to flow

• Because LDRs are designed to block current in the dark

• Because resistance is not affected by light

A diode’s current-voltage graph shows very high resistance until a specific voltage is reached. What does this indicate about the diode’s behavior?

• The diode allows current to flow at all voltages

• The diode never allows current to flow

• The diode only allows current to flow after a threshold voltage is reached

• The diode’s resistance is always constant