Flash Cards: Electricity: Magnetic and Heating Effects

When electric current flows through a conductor, it produces a magnetic field around it. This is known as the magnetic effect of electric current.

An electromagnet is a current-carrying coil that behaves like a magnet. It requires an electric current to generate its magnetic field.

When the electric current is stopped, the electromagnet loses its magnetic field and stops acting like a magnet.

The heating effect is when electrical energy is converted into heat energy due to the resistance faced by the current in a conductor.

Nichrome and copper are common materials used in wires. Nichrome has higher resistance, causing more heat to be produced.

Nichrome wire is used because it can withstand high temperatures and has a higher resistance, producing more heat when current passes through it.

A cell is a device that generates electric current through chemical reactions between two different metals and an electrolyte.

A Voltaic cell, or Galvanic cell, consists of two electrodes made of different metals and an electrolyte, generating electricity via chemical reactions.

A dry cell has its electrolyte in a paste form, whereas a Voltaic cell has a liquid electrolyte.

A rechargeable battery is a type of battery that can be recharged and reused multiple times, unlike single-use cells.

Heat generation increases with the magnitude of the electric current due to higher resistance in the conductor.

The magnetic effect of current is used in devices like motors, electric bells, fans, and lifting electromagnets.

A battery is considered dead if it can no longer generate a sufficient electric current to power a device.

Not all cells and batteries can be recharged. Only certain types, like rechargeable batteries, are designed for multiple uses.

The formula is H = I²Rt, where H is heat, I is current, R is resistance, and t is time.

A common mistake is using wires that are not rated for the current, which can cause overheating and fire hazards.

Safety devices such as fuses and circuit breakers are inserted to prevent overheating and protect appliances.

An electromagnet has two poles: North and South, similar to a regular magnet.