february 2nd session

Which device stores electrical charge?

• Resistor

• Transformer

• Capacitor

• Diode

Answer explanation

A capacitor is a device specifically designed to store electrical charge. Unlike resistors, transformers, and diodes, which serve different functions in electrical circuits, capacitors accumulate and release energy as needed.

What is the purpose of an insulator?

• To conduct electricity

• To prevent electrical flow

• To convert voltage

• To store energy

Answer explanation

The purpose of an insulator is to prevent electrical flow, which means it does not allow electricity to pass through it. This is essential for protecting circuits and ensuring safety.

Which component controls electrical current flow?

• Relay

• Conductor

• Battery

• Circuit breaker

Answer explanation

A relay is an electromechanical switch that controls the flow of electrical current in a circuit. It opens or closes circuits based on an input signal, making it essential for controlling current flow.

What is the function of a transformer?

• To store electrical energy

• To convert voltage

• To regulate current

• To block electrical flow

Answer explanation

The primary function of a transformer is to convert voltage levels in an electrical circuit, allowing for efficient power transmission and distribution. It does not store energy, regulate current, or block flow.

Which part of the transformer is connected to the power source?

• Secondary winding

• Core

• Primary winding

• Circuit breaker

Answer explanation

The primary winding of a transformer is connected to the power source. It receives the input voltage, which creates a magnetic field in the core, inducing a voltage in the secondary winding.

True/False: "A resistor increases electrical flow."

• TRUE

• FALSE

Answer explanation

A resistor does not increase electrical flow; instead, it opposes it, reducing the current in a circuit. Therefore, the statement is FALSE.

A _____ is used to switch circuits on/off automatically

Answer explanation

A relay is an electromechanical switch that opens or closes circuits automatically based on an input signal. It is commonly used in various applications to control high-power devices safely.

What is the role of a circuit breaker in an electrical system?

• To amplify electrical signals

• To store electrical energy

• To interrupt current flow during faults

• To convert AC to DC

Answer explanation

The correct choice is 'To interrupt current flow during faults' because a circuit breaker is designed to protect electrical circuits by stopping the flow of electricity when a fault, such as a short circuit, occurs.

Which device is used to convert electrical energy into mechanical energy?

• Capacitor

• Transformer

• Motor

• Generator

Answer explanation

A motor is the device that converts electrical energy into mechanical energy, allowing it to perform work, such as turning a fan or driving a pump. Other options like capacitors and transformers serve different functions.

True/False: "An inductor opposes changes in current flow."

• TRUE

• FALSE

Answer explanation

TRUE: An inductor resists changes in current due to its property of inductance, which generates a back electromotive force (EMF) opposing the change in current flow.