Test3: Electrical Circuits Quiz

Why does resistance affect current differently in series and parallel circuits?

• Resistance is constant in all circuits.

• In series circuits, resistance adds up, reducing current, while in parallel circuits, resistance decreases as branches are added, increasing current.

• Parallel circuits have higher voltage.

• Resistance has no effect on current.

How does the use of capacitors stabilize the power supply in electronic devices?

• By storing and releasing energy during sudden demand changes.

• By converting AC to DC.

• By reducing the total resistance in circuits.

• By amplifying the input voltage.

What factors make AC preferable for power transmission over DC?

• Lower power loss, simpler storage, and suitability for batteries.

• Easier voltage conversion, efficient transmission, and simpler generator design.

• Higher resistance and direct current flow.

• Constant voltage output and portability.

In a household circuit, why is a fuse or circuit breaker critical for safety?

• They increase the current flow during overloads.

• They interrupt the flow of electricity during overheating, preventing fires.

• They ensure voltage remains constant.

• They convert AC to DC for home appliances.

Why does current flow more through a resistor with lower resistance in a parallel branch?

• Lower resistance increases the voltage.

• Current inversely relates to resistance, so lower resistance allows more current to pass.

• Higher resistance blocks the voltage completely.

• Parallel branches evenly divide current regardless of resistance.

What is the fundamental unit of power consumption?

• Volt

• Ampere

• Watt

• Ohm

Which of the following best describes a transistor's role in a circuit?

• Stores electrical energy.

• Acts as a switch or amplifier.

• Converts AC to DC.

• Protects circuits by breaking connections.

What happens to total resistance when a new branch is added to a parallel circuit?

• It increases.

• It decreases.

• It remains constant.

• It depends on the branch resistance.

How is total resistance calculated in a series circuit with three resistors?

• Multiply individual resistances.

• Add all resistances together.

• Use the inverse sum of reciprocals.

• Divide total voltage by total current.

What is the relationship described by Ohm's Law?

• Voltage equals current divided by resistance.

• Voltage equals current multiplied by resistance.

• Power equals voltage multiplied by current.

• Current equals resistance divided by voltage.