Question

So that your grandmother can listen to A Prairie Home Companion, you take her bedside radio to the hospital where she is staying. You are required to have a maintenance worker test the radio for electrical safety. Finding that it develops $120V$ on one of its knobs, he does not let you take it to your grandmother’s room. Your grandmother complains that she has had the radio for many years and nobody has ever gotten a shock from it. You end up having to buy a new plastic radio.
(a) Why is your grandmother’s old radio dangerous in a hospital room?
(b) Will the old radio be safe back in her bedroom?

Answer 1

Many 120-V outlets are designed to accept a three-pronged cord One of the prongs is the live were at a nominal potential of 120V The second as the neutral wire which games current to ground The third wire as a safety ground ware that normally carries no current And makes low resistance path through the appliances to the ground. Analyze: In the given question we c can see that the hospital maintenance worker is right. A hospital room is full of electrical grounds, including the bed frame If your grandmother touched the faults knob and the bed frame at the same time, she could receive quite a felt, as there would be a potential difference of 120V across her If the 120V is DC, the shock could send her into...