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phys: clarify emf

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eggy 2021-02-09 19:03:10 -05:00
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docs/sph3u7.md
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@ -987,7 +987,10 @@ All cells have **internal resistance**, which is the resistance of th cell itsel
$$P=I^2r$$ $$P=I^2r$$
The voltage across the terminals of a battery is equal to, where $I_r$ is the current across the internal resistance: The voltage across the terminals of a battery is equal to, where $I_r$ is the current across the internal resistance:
$$V_AB=\epsilon-I_r$$ $$V_{AB}=\epsilon-I_r$$
The total voltage (emf) of a circuit can be found with Ohm's law:
$$\epsilon=I(R+r)$$
An **ammeter** measures the current of a load and must be in series with the load. Ideally it should have the lowest resistance possible. An **ammeter** measures the current of a load and must be in series with the load. Ideally it should have the lowest resistance possible.