Series vs. Parallel Circuits Experiment

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by Rosiedg
Last updated 5 years ago

Discipline:
Science
Subject:
Physics
Grade:
9,10,11,12

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Series vs. Parallel Circuits Experiment

CIRCUIT INVESTIGATION

Our Question

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Method

What did we do?

My Prediction

What I think will happen?

Series:1) Resistances will add to give total restance of the circuit.2) Voltage will drop across each resistor depending on the value of the resistor.3) Current will be the same across all resistors.Parallel:1) Total ressistance will be less than the sum of the resistances.2) Voltage will be the same across all resistors.3) Current will divide across the branches.

How do voltage, current and total resistance of a circuit change between series and parallel circuits?

Series:1) The resistance added to give the total resistance of the circuit. This is because they are in a row, and from one side to the other their resistances combine like they are just one big resistor.2) The voltage dropped across each resistor, consistant with the formula V = I*R.3) The current through all the resistors was the same, since there is only one path for the current to follow.

Series:1) I set up a series circuit with 3 resistors and measured the resistance across the power supply with the power supply off.2) I set the multimeter to voltage and placed it across each resistor with power supply off.3) I turned the power supply on and measured the voltage. 4) I turned the power supply off and placed the multimeter in between each resistor and set the multimeter to measure current.5) I turned the power on and measured the current through each resistor.Parallel:1) I set up 3 resistors in paralleland with the power supply off, measured the resistance across the power supply.2) I set the multimeter to voltage and placed it across each resistor with the power off.3) I turned the power supply on and measured the voltage.4) I turned the power off and placed the multimeter in between each resistor and set the multimeter to measure current.5) I measured the current through each resistor.

Results

What happened & Why?

Our Equipment

Parallel:1) The total resistances turned out to be the sum of the inverse of the resistances. This is because they are sharing the current, but have the same voltage across them.2) The voltage across each resistor was the same, since the two ends of each resistor is connected to the power supply.3) The current divided between the resistors, because there are 3 paths for the current to take. The current was highest across the smallest resistor. This is because the current takes the path of least resistance.


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