Flow of electricity
Which particles are responsible for the flow of electricity in a circuit?
Electricity flows because of electrons. Electrons are negatively charged particles that move through a circuit and create electric current.
What are circuit diagrams?
Circuit diagrams are drawings that show electrical circuits using standard symbols instead of real components.
In which unit is electric current measured?
Electric current is measured in amperes, also called amps, which show the amount of electric charge flowing in a circuit.
What do we call a device that supplies electrical energy to a circuit?
A cell is a device that supplies electrical energy to a circuit by converting chemical energy into electrical energy.
What do we call the flow of electrons in a circuit?
The flow of electrons in a circuit is called electric current. It is produced when electrons move through a closed path.
Why are circuit diagrams useful?
Circuit diagrams are easy to understand, act as a universal language, and help electricians and engineers communicate clearly
How are the probes of an ammeter connected in a circuit?
The red probe of the ammeter is connected to the positive side of the circuit, and the black probe is connected to the negative side.
What is electric current and how is it produced in a circuit?
Electric current is the flow of electric charges in a circuit. It is produced when electrons move through a closed circuit.
From which terminal do electrons start moving in a cell?
Electrons start moving from the negative terminal of a cell, which has more electrons, towards the positive terminal.
What is an ammeter and what is it used for?
An ammeter is an instrument used to measure electric current flowing in a circuit. The current is measured in amperes.
What should be done before connecting an ammeter to a circuit?
The power supply should be turned off before connecting an ammeter to prevent damage and incorrect readings.
What is the function of a switch in an electric circuit?
A switch is used to open or close a circuit, which controls the flow of electric current.
Which terminal of a cell has fewer electrons and why?
The positive terminal of a cell has fewer electrons, which attracts electrons from the negative terminal.
How should an ammeter be connected in a circuit and why?
An ammeter should always be connected in series so that all the current flows through it and gives correct readings.
Why should an ammeter never be connected in parallel?
An ammeter has very low resistance, so if connected in parallel, most current would pass through it and may damage the ammeter.
Why are metals commonly used for making electric wires?
Metals are used for electric wires because they are good conductors of electricity and allow electrons to flow easily.
What is voltage and what does it represent?
Voltage is the pressure that pushes electrons through a circuit. It is measured in volts and helps move electric current.
How do circuit diagrams save time and resources?
Circuit diagrams help plan circuits before building them, which reduces mistakes and saves time and materials.
Why is an ammeter connected in series instead of parallel?
Connecting an ammeter in series allows all the current to flow through it, ensuring accurate measurement of electric current.
What happens to the brightness of a bulb when more cells are added in a series circuit?
When more cells are added in a series circuit, the voltage increases and the bulb glows brighter.