Aim: To investigate parallel circuits, voltage and current Keywords: Parallel Circuit, Voltage, Current, Ammeter, Voltmeter This lesson we continued modelling series and parallel circuits off of the diagrams below. We also recorded the volts, amps and any brightness changes that occurred between different circuits. Here are the findings and comparisons between the circuits:Circuit 1 includes only one light bulb, connected to a switch and a transformer. Being the only electrical component in the circuit, the light bulb was able to use all 12 volts. This resulted in the light being so bright, that it turned white. However, as soon as we added a second light bulb, as seen in Circuit 2, each light was only able to use 6 volts, resulting in a much dimmer, yellow light. Circuit 3 is identical to Circuit 1, however it has an added ammeter. The ammeter is placed between the switch and transformer, and measures the amps or current that is flowing through the circuit. In this circuit, a total of 0.7 amps were recorded. Now in Circuit 4, we moved the ammeter to between the transformer and light bulb to record any changes. However, the current was still 0.7 amps and this is due to there being only one possible path in a series circuit. Circuit 5, as seen below, is the same as Circuit 4, with an added light bulb between the transformer and the switch. In Circuit 5, a total of 0.45 amps was recorded. This was less than Circuit 4 due to the added resistance of the first bulb. Circuit 6 was comprised of the transformer, the switch and then a parallel circuit with a voltmeter and bulb. When there was only one light bulb in the circuit, the voltmeter measured 12 volts. This showed that all the energy was being used by the singular light. In Circuit 7, another light was added between the parallel circuit and the transformer. Once the second light was added, the first light was only using 5.75 volts. This is due to the resistance of the added component. In Circuit 8, we moved the voltmeter to measure the second light bulb. The voltmeter only measured 5.25 volts being used by this light, showing that the resistance of the first light made the second dimmer. Lesson Summary: Constructed series and parallel circuits Measured volts and amps using an ammeter and voltmeter Recorded changes in voltage, brightness and current when different components were added, removed of repositioned.
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