Electricity: Conductors, Circuits and Electromagnets
Test your knowledge of basic electricity concepts including conductors and insulators, electric circuits, electromagnets, heating effects of current, and electrical safety devices.
Questions
Poor conductor of electricity is
- metal
- Plastic
- Iron
- None of these.
Electro magnet are used in appliances such as
- Electric bell
- Telephone
- Microphones
- All of these.
If the two terminals of a cell are connected directly with a wire, then
- The chemicals get used up very fast
- The cell explode
- no current
- More electrical energy is stored in the cell
Material used as heating element in electric iron ?
- Filament
- Nichrome
- Iron
- Steel
Current flows through the circuit when the circuit is in the ________condition.
- Closed
- Open
- Broken
- Incomplete
Heat produced in an electric circuit doesn't depends on
- Length of wire
- Thickness of Wire
- Nature of Material
- Color of wire
If you place a compass near a current conducting wire, it will:
- get deflected
- Get hot
- Stop moving
- Get charged
_________piece is attracted by an electromagnet
- Wood
- Iron
- Plastic
- Rubber
When a fuse is rated 8 A, it means _____________.
- it will not work if current is less than 8 A
- it has a resistance of 8 W
- it will work only if current is 8 A
- it will melt if current exceeds 8 A
An electromagnet is one which behaves as a magnet when current is ______
- Allowed to flow through
- Not allowed to flow through
- Stopped from flowing through it
- aaaaaaa
When electric current passes through a wire , it behaves like a magnet. This is the
- Magnetic effect of current
- Electrical effect of current
- Heating effect of current
- Optical effect of current
The heat energy produced by a glowing bulb can be minimised by using _____ bulbs in place of ordinary electric bulbs ( )
- A candle
- CFL bulbs
- Torch
- Kerosene lamp
Electric Bell works on the principle
- Electrical energy is converted into mechanical energy
- Electrical energy is converted into sound energy
- Mechanical energy is converted into sound energy
- Sound energy is converted into electrical energy.
The instrument used for measuring electric current is :
- ammeter
- galvanometer
- voltmeter
- potentiometer
An electrical wire is covered with plastic to
- make it strong
- make it thicker
- make it look nice
- make it safe
Good Conductor of electricity is
- Distilled water
- Wood
- Plastic
- None
Which of the following statements does not represent ohm's law?
- current / potential difference = constant
- potential difference / current = constant
- potential difference = current x resistance
- current = resistance x potential difference
A glowing filament will be
- At a low temperature
- At a high temperature
- At atmospheric temperature
- At the temperature of ice
The combination of two or more cells is called
- switch
- Cell
- Battery
- fuse
The wire which melts and breaks the circuit when large current is allowed to flow through it is called
- A fuse wire
- Electric wire
- Connecting wire
- Filament