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Transcript
9.1 Series and Parallel Circuits BC Science 9: p. 306-319 Voltage and Current in Circuits • The voltage in a circuit must always be consumed before returning to the source. • The sum of the voltage lost on the loads of the circuit will equal the total voltage of the source. • The current in a circuit must always be accounted for and will never disappear or be consumed. – Current in a circuit is similar to water flowing through pipes. Series Circuits • There is only one path for current to travel. • Since there is only one path for the electrons in a series circuit, the current in each part is equal. • Current must pass through all loads in the circuit. Series Circuits • The voltage is shared by all loads in the circuit and be used up before returning to the source. • Each load in a series circuit uses a portion of the total voltage. • When a load or resistor is added in series, the overall resistance of the circuit increases. Parallel Circuits • • • • There are multiple paths for current to travel. Current will split as some electrons go each way. When the pathways re-join, so does the current. The sum of the current in the pathways must equal the overall current in the circuit. Parallel Circuits • When the electrons cycle through the circuit they must choose only one path. • The voltage drop at each load is equal to the voltage supplied by the source. • When a load or resistor is added in parallel, the overall resistance of the circuit decreases.