Basics of LED, DC Motor, and Switch

What is the working principle of an LED?

• An LED emits light when an electric current passes through it, causing electron-hole recombination in a semiconductor.

• An LED produces sound when voltage is applied.

• An LED generates heat when an electric current flows through it.

• An LED changes color based on the temperature of the environment.

Which type of DC motor is known for high starting torque?

• Stepper motor

• Permanent magnet DC motor

• Series DC motor

• Shunt DC motor

What is the function of a toggle switch?

• To increase the voltage in a circuit.

• To measure electrical resistance.

• To control the brightness of a light.

• To switch between two states, typically on and off.

In which application are LEDs commonly used?

• Lighting, displays, indicators, and backlighting

• Wind turbines

• Batteries

• Solar panels

Which component is essential for completing an electrical circuit?

• Insulator

• Transformer

• Conductor

• Resistor

What type of DC motor is typically used in toys?

• Permanent magnet DC motor

• Stepper motor

• Synchronous DC motor

• Brushless DC motor

What is the primary function of a push-button switch?

• To store electrical energy for later use.

• To control the flow of electricity in a circuit.

• To increase the voltage in a circuit.

• To convert electrical energy into mechanical energy.

Which type of LED emits light in a specific color?

• Ultraviolet LEDs

• Infrared LEDs

• Colored LEDs

• White LEDs

What is the role of a resistor in an LED circuit?

• The role of a resistor in an LED circuit is to limit the current flowing through the LED.

• To increase the brightness of the LED.

• To convert AC to DC for the LED.

• To store electrical energy for the LED.

Which component can control the flow of electricity in a circuit?

• Resistor

• Capacitor

• Inductor

• Switch