# Basic knowledge of electronics: voltage

What is voltage?

We can simplify the concept of voltage to the electric potential at which electrons must flow from a higher voltage area to a lower voltage area.

we usevolt(`V`).

The higher the voltage, the more electrons flow in the circuit: this is what we callcurrent.

Imagine a circuit with LED lights. You can use a 1.5V battery to power it to make the LED light up. If you add a 3V battery, the lamp will emit more light because more current flows in the circuit.

The earthâ€™s zero potential is 0V (zero volts), which we callground.

Voltage is a relative measure. It measures the potential difference between two points. So, for example, when we say 5V, this is relative to the ground.

Most commercial DC (direct current) electronic equipment will operate at 5V or 12V.

AA batteries can provide 1.5V power. this means`+`The pole voltage of the battery is 1.5V higher than that of the battery`-`pole. Some devices use multiple batteries connected to each other to provide a higher voltage, such as 3V, where 2 batteries are connected toseries.

Your house uses 230V (Europe) or 110V (United States) AC (Alternating Current) for wiring, and different countries/regions may have different values.

This is why the equipment requires different transformers to work in different countries

We can use tools such as multimeter equipment to measure voltage.