Important Questions Test: Electric Current & its Effects

A battery consists of some number of voltaic cells. Each cell consists of two half-cells connected in series by a conductive electrolyte containing metal cations.

The chemical reactions in the battery causes a build up of electrons at the anode.

Experiences a force when it is in a magnetic field

for the duration for which current flows through it

When an electric current flows through a conductor, it becomes hot because,the resistance of the conductor blocks the electricity flow.

The magnetic effect of current was discovered by H.C. Oersted. 

It acts as safeguard against excessive current. When the current exceeds certain limit the fuse wire gets broken and so it acts as a safeguard.

The soft iron inside the coil makes the magnetic field stronger because it becomes a magnet itself when the current is flowing. Soft iron is used because it loses its magnetism as soon as the current stops flowing. Soft iron is said to form a temporary magnet. In this way, the electromagnet can be switched on and off by turning the electricity on and off.

The metal tungsten is used for the filaments in incandescent bulbs. It has a high melting point and retains its strength when heated. The tungsten's resistance makes it glow white-hot, and inert gases (mostly nitrogen) in the bulbs keep the tungsten from oxidizing.

electrical energy into mechanical energy

The key or switch can be placed anywhere in the circuit. When the switch is in the 'ON' position, the circuit from the positive terminal of the battery to the negative terminal is complete.

The chemical energy stored in two cells is more than one. The electrical energy used by one bulb is less than the energy used by two bulbs. So the bulb in the circuit that has one bulb and two cells will glow the brightest.

Tester is used to check whether electricity is flowing through a substance.

It makes it easier to draw the circuit diagrams

Copper tungsten materials are often used for arcing contacts in medium to high voltage sulfur circuit breakers in environments that can reach temperatures above 20,000K.

Dry cells are more durable, they are typically used for remote controls, flashlights and other similar handheld devices.

An ammeter is an instrument used for measuring electric current in units of amperes. An ammeter must be connected in series with the path of the current being measured.

When an electric current is passed through the wire of the coil to generate a magnetic field, or conversely an external time-varying magnetic field through the interior of the coil generator and energy is also lost in the form of heat.

Electromagnetism is a branch of Physics, deals with the electromagnetic force that occurs between electrically charged particles.

The material mainly used for fuse element are tin, lead, silver, copper, zinc and alloy of lead and tin. An alloy of lead and tin is used for small current rating fuses