Potential difference is a value you measure between two points in a conductor. **It is the cause of a current flowing in your circuit.** Suppose you have a resistance `R` with current `I` passing through it. With the variables given, you can calculate the potential difference between the terminals of...

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Potential difference is a value you measure between two points in a conductor. **It is the cause of a current flowing in your circuit.**

Suppose you have a resistance `R` with current `I` passing through it. With the variables given, you can calculate the potential difference between the terminals of your resistor. Just use the following formula:

`V = RI `

**So, generally, potential difference is a dependent variable - because it depends on other variables that you can potentially measure.** **Now, electromotive force is an independent variable. You can't solve it in terms of other things in your given system (actually, that's not entirely true, but we're assuming that)**. Just look at the outlet of your house--it probably gives out a voltage of around 220V. It does not depend on the resistance of your circuit. So its electromotive force is 220V. With it, we can calculate the current going through a resistance connected to it. See the difference?**You can think of electromotive force as the ability of a source (say a battery) of generating currents in your circuit.**