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Starting electronics
Figure 1.4 Even when the battery is disconnected and electrons do not flow, the
battery still has a potential difference
the difference in numbers of electrons between two points
(terminals in the case of a battery) is known as the potential
difference. A more usual name for potential difference,
though, is voltage, shortened to volts, or even the symbol V.
Individual cells are rated in volts and so a cell having a voltage
of 3 V has a greater potential difference than a cell having
a voltage of 2 V. The higher the voltage, the harder a cell can
force electrons around a circuit. Voltage is simply a way of
expressing electrical pushing power.
Relationships
You’d be right in thinking that there must be some form of
relationship between this pushing power in volts and the rate
of electron flow in amps. After all, the higher the voltage, the
more pushing power the electrons have behind them so the
faster they should flow. The relationship was first discovered
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