electric current summary - IB PHYSICS SUBSIDIARY LEVEL...

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IB PHYSICS SUBSIDIARY LEVEL ELECTRIC CURRENTS SUMMARY 5.1 Electrical potential difference, current and resistance An elementary charge is the charge on an electron or a proton. The total charge of 6.242 x 10 18 elementary charges is called 1 Coulomb. The Potential Difference between two points is 1 Volt when 1 Coul of charge transfers 1 Joule. Energy transferred in Joule equals Pot Diff in Volts x Charge moved in Coul. 1 electronVolt eV is a very tiny unit of energy. 6.242 x 10 18 eV equals 1 Joule. 1 eV equals 1.6 x 10 -19 Joule. Energy transferred in electronVolts = no. of elementary charges times Potential difference in Volts. When the same current is in two long parallel wires 1 metre apart and each metre attracts 1 metre of the other wire with a force of 2 .0 x 10 -7 N, the current in each is 1 Ampere. When 1 Coulomb of charge passes each second the current is 1 Ampere. Current in Amperes = charge in Coul that passes divided by time in sec.
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