WorksheetsElectric Current and its Effects - 1
Total questions: 23
Worksheet time: 14mins
Longer line in the symbol for a cell represents its (a) terminal.
The combination of two or more cells is called a .
(a)
When current is switched ‘on’ in a room heater, it
(a)
The safety device based on the heating effect of electric current is called a
(a)
To make a battery of two cells, the negative terminal of one cell is connected to the negative terminal of the other cell.
true
false
When the electric current through the fuse exceeds a certain limit, the fuse wire melts and breaks.
true
false
An electromagnet does not attract a piece of iron.
true
false
An electric bell has an electromagnet.
true
false
What is electric current?
flow of electrons.
flow of electro magnet
Why does light bulb get hot?
Hans Christian Oersted discovered magnetic effect of current.
Light bulb gets hot due to heating effect of the electric current.
Who discovered magnetic effect of current?
Hans Christian Oersted discovered magnetic effect of current.
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How does a bulb glow?
in the bulb there is a thin wire, called the filament, which glows and gives off light when an electric current passes through it.
in the bulb there is a thin wire, called the filament
Write some uses of battery.
torches, transistors, toys, TV remote controls, use batteries.
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Which wire used in electric heater and why?
Nichrome wire is used in electric heater because it has a high melting temperature.
electric heater because it has a high melting temperature.
What is filament?
which glows when anelectric current passes through it.
in the bulb there is a thin wire, called the filament, which glows when anelectric current passes through it.
Is it possible for a wire to melt and break? Why?.
The wire gets hot when an electric current passes through it. This is the heating effect of the electric current.
Yes, if a large current passes through a wire, the wire may become so hot that it may even melt and break.
. What is the heating effect of the electric current?
The wire gets hot when an electric current passes through it. This is the heating effect of the electric current.
The credit for the invention of the electric bulb is usually given to Thomas Alva Edison, though others before him had worked on it.
Who invented electric bulb?
Hans Christian Oersted
The credit for the invention of the electric bulb is usually given to Thomas Alva Edison, though others before him had worked on it.
What are the uses of heating effect of electric current?
Electrical appliances, such as immersion heaters, hotplates, irons, geysers, electric kettles, hair dryers uses of heating effect of electric current.
In the symbol of the electric cell, the longer line represents the positive terminal and the thicker, shorter line represents the negative terminal.
Explain the symbol of electric cell.
Electrical appliances, such as immersion heaters, hotplates, irons, geysers, electric kettles, hair dryers uses of heating effect of electric current.
In the symbol of the electric cell, the longer line represents the positive terminal and the thicker, shorter line represents the negative terminal.
Name any effects of electric current.
Heating effect of electric current
Magnetic effect of the electric current
Why are fuse wires not used in circuit containing electric cell?
The bulb glows only when current flows through the circuit.
Fuse wires are not used in circuit containing electric cell because the amount of current follow is low and if the circuit breaks there is no risk of fire.
What is an electric circuit?
The electric circuit provides a closed path for electricity to pass between the two terminals of the electric cell. The bulb glows only when current flows through the circuit.
electricity to pass between the two terminals of the electric cell.
