voltage divider doubt

[karthikeid]

hi

i have posted a circuit wch is a voltade divider in this wat must be the wattage of the resistor?? the load is the 4leds in parallel.
tell me the calculation too.

View attachment 41049

 

[Hero999]

R2 isn't needed because LEDs need a constant current not a constant voltage.

Use the normal LED resistor formula which can be found using Google and calculate the power dissipation in the resistor using Ohm's law P = I2R