# What is difference between constant current and constant voltage?

## What is difference between constant current and constant voltage?

The term “constant” is relative. A CC power source will maintain current at a relatively constant level, regardless of fairly large changes in voltage, while a CV power source will maintain voltage at a relatively constant level, regardless of fairly large changes in current.

### How many volts does a TV use?

120 volts

#### What is the max voltage for an LED?

VL = LED voltage (2V, or 4V for blue and white LEDs). The LED current must be less than the maximum permitted for your LED. For standard 5mm diameter LEDs the maximum current is usually 20mA, so 10mA or 15mA are suitable values for many circuits.

What does a LED do in a circuit?

Light-emitting diodes (LEDs) and lamps produce light when a current flows through them in the forward direction. LEDs and lamps are often used for indicator lights in electrical equipment, such as computers and television sets. As LEDs use a much smaller current than other types of lighting, their use is increasing.

What happens when an LED is directly connected to a power supply?

What happens when an LED is directly connected to a power supply? When the LED is directly connected to power (AC – Altering Current), it burns. The optimal voltage and current required for an LED in 2–3 Volts and 10–30mA (12–20mA is the most common range)respectively.