What Is the Formula to Calculate Resistance?
“Hi, I’m Steve Jones and I’m going to tell you something about resistance and the formula to measure it. Well, what is resistance? Let’s just quickly, say that, if I have a power supply of some kind, and I attach it to, for example, a heater, let’s say this is a heater, then we know, that the heater gets hot. The heater uses energy, and because it uses energy, we say it has resistance. If it has resistance, it uses energy. The power supply also has a little resistance, and therefore that gets hot, and that wastes energy. But, there is a simple law, called ohms law, which enables us to calculate the resistance of a resistor, say a heater, and the value is given in ohms. Now, the first thing is, we have two quantities in the circuit, which we have to measure. We have, what we call the voltage, V, or the potential difference, more correctly, and we have the current, I. I is the current. We can measure both of these quantities with meters, and we know, that the relationship, between, the r
