POWER LAMP RESISTOR

@bbclyde1

8 years ago

https://everycircuit.com/circuit/4781438519214080

Lamp rating: 3.5V, and 500mW. Using P=VI, so I=P/V =0.5/3.5 so I =142mA. Voltage across R is 15-3.5 = 11.5V So Using R=V/I then R =11.5/142mA So R=81Ohms