Which part of a bicycle dynamo spins to generate electricity?
The magnet in a bicycle dynamo spins to generate electricity by moving through a coil, thereby inducing an electric current.
The electricity from a cell is called:
A cell provides direct current (DC), which flows in one direction only.
The electricity we use in our homes and schools is called:
Homes and schools use alternating current (AC), which periodically reverses direction.
Which of the following is NOT a renewable energy source?
Natural gas is a fossil fuel and is not renewable.
The electronic device which is used as a switch or amplifier is called a:
A transistor is used as a switch or amplifier in electronic circuits.
IC stands for:
IC stands for Integrated Circuit, which is a set of electronic circuits on one small flat piece of semiconductor material.
Silicon is an example of:
Silicon is a semiconductor material, meaning its conductivity is between that of a conductor and an insulator.
Barcode reader is an:
A barcode reader is an input device used to capture and read information contained in a barcode.
Flow of electrons is called:
The flow of electrons is known as electric current.
When animals and plants are decayed in absence of air, there produces a gas called:
When organic matter decays in the absence of air, it produces methane gas.
How can electricity be generated?
Electricity can be generated by moving a magnet through a coil, which induces a current in the coil due to electromagnetic induction.
Which of the following is a low-cost source of electricity generation?
Solar energy is a low-cost and renewable source of electricity generation.
What does electronics mainly deal with?
Electronics mainly deals with controlling electrical energy using various components and circuits.
What plays the fundamental role in electronics?
Electrons play the fundamental role in electronics as their movement constitutes electric current.
What is the main function of a diode?
A diode's main function is to allow current to flow in one direction only.
A transistor is best described as:
A transistor is best described as a switch that controls the flow of electricity in electronic circuits.
What is electricity?
Electricity is the flow of electrons around a circuit.
Which device produces electricity through chemical reactions?
A battery produces electricity through chemical reactions.
Which of the following methods can produce electricity mechanically?
Moving a magnet through a coil can produce electricity mechanically through electromagnetic induction.
What type of current is generated when the current in a coil changes direction regularly?
When the current in a coil changes direction regularly, it generates Alternating Current (AC).
What is the function of brushes in a generator?
The function of brushes in a generator is to maintain contact with the slip rings, allowing current to flow from the rotating coil to the external circuit.
What simple device on a bicycle is used to generate electricity?
A bicycle dynamo is a simple device used to generate electricity by converting mechanical energy into electrical energy as the bicycle moves.
What do solar panels use to generate electricity?
Solar panels use photo-voltaic cells to convert sunlight directly into electricity.
A solar-powered calculator mainly works by:
A solar-powered calculator works by converting sunlight into electrical energy using solar cells.
Which component of the wind energy system helps in electricity generation?
In a wind energy system, the fan (or turbine blades) captures wind energy and converts it into mechanical energy, which is then converted into electricity.
Nuclear energy is produced through a process called:
Nuclear energy is typically produced through the process of fission, where the nucleus of an atom splits into smaller parts, releasing energy.
What is released when nuclear fission occurs?
When nuclear fission occurs, heat energy is released, which can be used to generate electricity.
What kind of current changes its direction periodically?
Alternating current (AC) changes its direction periodically.
Which current flows in only one direction?
Direct current (DC) flows in only one direction.
What happens to the voltage in AC?
In Alternating Current (AC), the voltage reverses along with the current.
Which component is used to convert AC to DC?
A diode is commonly used to convert AC to DC by allowing current to flow in only one direction.
What is the process of converting AC to DC called?
The process of converting AC to DC is called rectification.
Which basic component of an electronic system opposes the flow of electrons?
A resistor is a basic component that opposes the flow of electrons, thereby limiting the current flow in a circuit.
What is the unit of resistance?
The unit of resistance is the ohm (Ω).
Which material is a diode made from?
A diode is made from semiconductor material, typically silicon or germanium.
What is the function of a Light Emitting Diode (LED)?
The function of a Light Emitting Diode (LED) is to emit light when current passes through it.
Which component acts like an electronic switch to control flow of current?
A transistor acts like an electronic switch to control the flow of current in a circuit.
Which of the following is NOT an input device?
A speaker is not an input device; it is an output device that produces sound.
Which device is used to convert voice into an electrical signal?
A microphone is used to convert voice or sound into an electrical signal.
In a computer, the processor is located in the:
In a computer, the processor is located in the Central Processing Unit (CPU), where it performs calculations and processes instructions.
Which of these devices is considered an output device?
A printer is considered an output device as it produces a hard copy of digital information.
A smartphone screen is an example of:
A smartphone screen is an example of an output device that displays visual information to the user.
What is the sequence of information flow in an electronic system?
The sequence of information flow in an electronic system is typically Input → Processor → Output.
Which of these components acts as the brain of a computer system?
The processor acts as the brain of a computer system, performing calculations and managing data flow.