Olympiad Test: Electric Current & its Effects

A dry cell is used in torches and other devices that are mobile.

MCB is electric circuit stands for miniature circuit breaker used to break circuit in case of excess of current.

Electromagnet is used in electric bell. When switch is closed the, current flows and electric bell works.

Electric current is measured by a device called ammeter. It is always connected in series in circuit.

Fuse wire is made up of alloys of low melting point that melts if higher current flows through the circuit.

The coils of heating devices are made up of Nichrome, which is an alloy having very high resistance and high melting point.

Wire carrying current produce attracts the magnetic material due to magnetic field.

A material having very high resistance is called an insulator.

Potential difference is created in an electric circuit due to cell or battery.

Heating effect of electric current is used in bread toaster having coils of high resistance and melting point.

Fuse is a safety device that is used in electric circuit to prevent electrical appliances and circuit in case of very high current.

All metals are good conductor of electricity but mercury is poor conductor of electricity.

A device that breaks the electric circuit in case of excess of current is called fuse wire.

Silver metal is best conductor of electric current out of all metals due to very high resistivity.

Heater is a device that converts the electric energy into heat energy.

Nichrome is used in coil of heater because it has high resistance and high melting point.

Combination of two or more cell in series is called battery. Battery creates potential difference to flow current.

Closed and continuous path of electric current is called electric circuit.

When live wire and neutral wire of a circuit come together, short circuit occurs to increase the temperature of circuit.

In electrical wiring, the wire with black insulation is usually neutral wire and red insulation with live wire.