2006-09-07 02:41:24 · 3 answers · asked by true_friend 1 in Science & Mathematics ➔ Engineering
Often time, high wattage, low ohm resisters will have two mounting tabs on each end - but if you look at the printed circuit where the resister mounts, you will see that it is a common connection on each end - and each end of the resister is also just one electrical connection. This is done to insure a good and solid electrical connection from the resister to the circuit board.
2006-09-07 03:04:17 · answer #1 · answered by LeAnne 7 · 1⤊ 0⤋
It's called a 'Kelvin' termination. Two of the leads are used in the circuit which supplies current to the resistor, and the other 2 are used to measure the voltage generated across the resistance by the current through it. This gets you out from under problems with the series resistance(s) of solder joints, screw terminal connections, etc. in low-resistance, high-current circuits.
Doug
2006-09-07 10:26:01 · answer #2 · answered by doug_donaghue 7 · 1⤊ 0⤋
In electrical, resistance has only 2 terminals regardless of resistance.
If you are referring to temperature sensor say PT100, it has either 3 terminals or 4 terminals but resistance sensor element has only 2 wires, additional terminals are added for compensation of wire resiatance for remote installation.
2006-09-07 09:53:42 · answer #3 · answered by dwarf 3 · 1⤊ 0⤋