PHYSICS: internal resistance and emf and physical quantites
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5 Terms
1
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internal resistance
constant opposition to current flow inside a source of e.m.f.
2
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two effects of internal resistance
1) as more current is drawn from a source of e.m.f., the voltage across the terminals of the supply falls;
2) the source of e.m.f. is less than 100% efficient as energy is dissipated as heat within it.
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base units
units from which all other units are derived
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derived quantity
quantity that is made by combining two or more base quantities.
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a derived unit
unit made up of a combination of two or more base units.
Note 
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