Concept of Current Electricity

Electric current is calculated by the formula:

$I = \frac{Q}{t}$

Where:

I = Electric current in amperes (A)

Q = Charge in coulombs (C)

t = Time in seconds (s)

This means that current is the amount of charge flowing per second.

You can also rearrange the formula to find the charge:

$Q = I \times t$

The SI unit of electric current is the ampere (A). Other related units include:

Milliampere (mA): $1\ \text{A} = 1000\ \text{mA}$

Microampere (µA): $1\ \text{A} = 1{,}000{,}000\ \text{µA}$

Kiloampere (kA): $1\ \text{kA} = 1000\ \text{A}$

So, if 1 coulomb of charge flows through a wire every second, the current is 1 ampere.

An ammeter is the instrument used to measure electric current. It is always connected in series with the circuit component so that the current passes through it.

A coulomb (C) is the quantity of electric charge that flows past a point in a circuit in one second when the current is 1 ampere.

$1\ \text{C} = 1\ \text{A} \times 1\ \text{s}$

Electric current plays an essential role in our daily activities. Its applications include:

1. Cooking: Used in electric cookers, microwaves, ovens, etc.
2. Lighting: Powers light bulbs, lamps, and other lighting devices.
3. Communication: Powers devices like phones, radios, TVs, and computers.
4. Heating: Used in heaters, electric irons, water boilers.
5. Industry: Powers heavy machines, manufacturing systems, and robotic automation.

Electric current comes from devices that convert other forms of energy into electrical energy. The two main types are:

Batteries – These convert chemical energy into electricity. Examples: phone batteries, dry cells, and car batteries.

Generators – These convert mechanical energy into electricity. Example: power stations use turbines to turn generators.

Other sources include:

1. Hydroelectric power: Water falling from dams spins turbines to produce electricity.
2. Solar energy: Solar panels turn sunlight into electricity.
3. Wind energy: Wind turns blades of windmills that generate electricity.
4. Ocean waves : Movement of water can also be used to create electric power.