PH 122 Lecture Notes - Residual-Current Device, Ground And Neutral, Mercedes-Benz W120
Document Summary
This side of the plug is larger, so you can"t plug it into the hot side of an electric outlet. The following devices are plugged into outlets on the same 120v circuit in a house. This circuit is protected with a 15 a circuit breaker. V = 250 w/120 v = 2. 1 a. It"s a summer evening, and the skin of her perspiring hands has a resistance of 4000 . She accidentally touches the (grounded) metal frame of the lamp and the (hot) inside terminal. 4000 + 310 + 30 + 310 + 4000 = 8650 . = 120 v/8650 = 0. 014 a = 14 ma. You are in the tub, with your lower body well grounded. You reach out and, with one hand, touch a poorly wired appliance with a hot case. The skin resistance of your wet hand is only 100 . = 120 v/440 = 0. 27 a = 270 ma.
