## Quiz Question

Every time any quiz comes in any trade magazine, the first thing I do is cover the answer and try my skill. That’s the same thing I did recently when the “Fundamental’s” Ohm’s Law quiz was given in the March 12 issue.

I checkmarked all six answers, but unfortunately I got No. 5 wrong. The question was as follows: “What happens to the amperage of an electric heating element when there is a decrease in the voltage supplied to the circuit?” I marked my answer as “Amperage is increased by voltage changes,” but NATE’s Mr. Patrick Murphy, who presented this quiz, marked the answer “Amperage is decreased by voltage changes.” How? This is totally confusing.

I know the basic logic of amps and voltage. If any condensing unit of 110/115 volts gives 14 amps, the same unit made for 208/220 V will give you 7 A. The same thing here, if the voltage drops, then the amps will increase and if voltage is increased, certainly the amps will decrease, which either way is no good to any condensing unit or to a compressor unless it’s ±10% in the voltage range.

Doesn’t this logic apply to an electrical heating element? And why is it different? Can anyone explain this to me?

Miguel Barreto Mike’s Refrigeration Service Plus Union City, NJ

Publication date: 04/09/2001