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level: Electrical sources and internal resistance

Questions and Answers List

level questions: Electrical sources and internal resistance

QuestionAnswer
what is e.m.felectromotive force the voltage measured across the terminals of supply when no current is being drawn
what is emf measured inVolts
what is internal resistancethe resistance of the material that makes up a cell
what is the symbol for internal resistancer (small r)
what is internal resistance measured inohms
what is an ideal supplyan electrical supply that has no internal resistance
what is meant by lost voltsthe potential difference across the internal resistance
what is t.p.dterminal potential difference the energy transferred to each coulomb of charge passing through the supply when a current is being drawn
is the terminal potential difference usually higher or lower than the e.m.flower
what is the formula for e.m.fe.m.f = t.p.d + Ir
what is the formula for lost voltslost volts = Ir
what is the relationship between t.p.d and currentas current increases, t.p.d decreases
when do you get maximum terminal potential difference in a cellwhen current is 0
when there are no lost volts in a cell what happens to t.p.dit becomes equal to the e.m.f of the battery
how do you find the e.m.f of a battery from a t.p.d against current graphfind the y intercept
what is an open circuita circuit where there is no current flowing
what is meant by short circuitwhen two wires connect directly across a component and the current flows through the short rather than through the component
what is the resistance of a short circuitzero or very little
what is short circuit currentthe maximum current a battery can deliver when external resistance of the circuit is zero
how do you find the internal resistance from a voltage against current graphtake the negative of the gradient