# E.M.F - Electro Motive Force

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What is the E.M.F definition?
The total energy transferred by source to each coulomb of charge passing through it
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When charge flows through a cell it is given what by the cell.
Energy
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What is the Emf of the cell?
The number of joules given to each coulomb of charge that passes through the cell.
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Emf is a type of what?
potential difference/voltage
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What is Emf measured in?
Volts (V)
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An electrical cell is made from materials, such as what?
metals or chemicals
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Why does a cell have resistance?
All materials have some resistance
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Some energy is wasted as what as soon as a current is drawn?
Heat
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What is the symbol for internal resistance?
r
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What is the typical resistance value for a rechargeable battery?
0.2 Ohms
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What is the typical resistance value for a car battery?
0.01 Ohms
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What is the symbol for "lost volts"?
Ir
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Equation for E total in series
E1 +E2
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Equation for r total in series
r1 + r2
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## Other cards in this set

### Card 2

#### Front

When charge flows through a cell it is given what by the cell.

Energy

### Card 3

#### Front

What is the Emf of the cell?

### Card 4

#### Front

Emf is a type of what?

### Card 5

#### Front

What is Emf measured in?

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