College Physics 10th Edition by Raymond Serway,Chris Vuille

تمرين 90

Figure P21.4 shows three lamps connected to a 120-V AC (rms) household supply voltage. Lamps 1 and 2 have 150-W bulbs; lamp 3 has a 100-W bulb. For each bulb, find (a) the rms current and (b) the resistance.