Recent content by estike

i know what i did wrong it was 240 ohms i made a stupid error W = 1/12A*20V and then it is 1,67 W

but the answers are 60W , 1.67 W , 20W or 120W i really don't understand then :x

so is 120 = R * 0.5A = 60 ohms And then 20 = 60*I = 1/3 A so W = 1/3A*20 V = 6,66 watts right

hum ok i understand know so if V= RI since 220 = R *0,5A = so the resistence is 110 ohms and since is constant 20 = 110*i = so I =0.182 A So P = I*V = 0.182 A*20 = 3.6 Watts ? Am i right ?

if 60 = 120 * I = 0.5 A I use this current and know that is 120V*0.5A = W right ? and W is 60 right

W = VC right ?

Ohm´s law V=RI

I don't know where to start i know that the power dissipated is in Joules but i don't know what equation to use

Homework Statement What is the power dissipated by a 60 Watt (rated at 120 V) light bulb if it is connected to a 20 V power source (assume the resistance of the bulb is constant)? Homework EquationsThe Attempt at a Solution If it [/B]