Question

If an LED had power rating of 150 milliwatts at 1.5 volts , how much current is used

Answer 1

The relation between Power, Current and Voltage is given as:

      P = V i

where P is Power in Watts,

V is Voltage in Volts,

and i is Current in Ampere.

We are given:

Power = 150 milliwatts = 0.15 Watts

(as 1 milliwatt = 0.001 Watts)

Voltage = 1.5 volts

and we need to find the current.

Hence using above equation:

P = V i

i = $\frac{P}{V}$

i = $\frac{0.15}{1.5}$

i= 0.1 Ampere

Answer:

The current used is 0.1 Ampere