Electric currents
Definition:
Electric current is the flow of electric charge.
Here’s the idea in simple, clear words:
• Every object has tiny charged particles (electrons).
• When these electrons start moving in one direction through a wire, we say an electric current is flowing.
• The faster the charge moves, the higher the current.
• We measure current in amperes (A).
• Rule to remember: 1 ampere = 1 coulomb of charge passing a point every second.
Simple picture:
Imagine charge is like water and the wire is a pipe. When water flows through the pipe, that’s like electric current flowing through a wire.
Ampere:
One ampere (1 A) is a measure of how fast electric charge is flowing.
Exact meaning:
1 ampere = 1 coulomb of charge passing a point every 1 second.
So if 1 coulomb (a certain amount of electric charge) moves past any point in a wire each second, the current in that wire is 1 ampere.
Simple picture:
If electric charge were water, 1 ampere would mean a steady, fixed amount of water flowing past you every second.
How to calculate current:
You calculate ampere (current) using Ohm’s Law:
Current (I) = Voltage (V) ÷ Resistance (R)
So:
I is current in amperes (A)
V is voltage in volts (V)
R is resistance in ohms (Ω)
Example:
If a 6-volt battery is connected to a wire that has 3 ohms of resistance:
I = 6 ÷ 3 = 2 amperes
That means 2 coulombs of charge pass every second.
Volt and Ohm:
VOLT (V)
• Volt is the push or pressure that makes electric charges move.
• Higher voltage = stronger push.
• A battery’s voltage tells you how hard it pushes electrons through a circuit.
Easy picture: Volt is like the water pressure in a pipe.
OHM (Ω)
• Ohm is the resistance to the flow of electric current.
• It tells you how much a material or device opposes the movement of electrons.
• Higher resistance = harder for current to flow.
Easy picture: Ohm is like a narrow part of a pipe that slows down the water.
Together:
• Voltage (the push) tries to move charges.
• Resistance (the opposition) tries to slow them down.
• The result of both is the current (ampere) that actually flows.