ELECTRIC CURRENTS. SIMPLE CIRCUIT What’s providing the energy? What’s “moving” in the circuit? What’s causing the movement? e.m.f. = Electromotive Force.

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Presentation transcript:

ELECTRIC CURRENTS

SIMPLE CIRCUIT What’s providing the energy? What’s “moving” in the circuit? What’s causing the movement? e.m.f. = Electromotive Force not a force, but the potential difference in volts

ELECTROMOTIVE FORCE (EMF)

CIRCUITS If the potential difference of the light bulb is 12V, what is the potential difference of the source in theory? What voltage would we measure in a lab?lab Internal Resistance is always present!

RESISTORS What does it mean for 2 resistors to be connected: In Series? In Parallel? Do you remember Kirchoff’s Laws?

KIRCHOFF’S LAWS CONSERVATION OF ENERGY CONSERVATION OF CHARGE

OHM’S LAW + KIRCHOFF’S LAWS = EQUIVALENT RESISTANCE IN SERIES

OHM’S LAW + KIRCHOFF’S LAWS = EQUIVALENT RESISTANCE IN PARALLEL

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