![]() ![]() Investigation: What happens to the current strength when cells are connected in parallel? Investigation: How does adding resistors in parallel affect the current strength? Investigation: Testing the current strength Investigation: How does adding more cells in series affect the current? Investigating, hypothesising, following instructions, observing, interpreting, recording, analysing, writing, working in groups Investigation: What happens when we add more resistors in series? These simulations will run directly within your browser from our website, Here is a link to a guide (in pdf format) written by PhET in the use of some of the electric circuit simulations: /files/teachers-guide/circuit-construction-kit-dc-guide.pdf You can also use the PhET simulations where learners can build their own circuits and test them out, observing the effects when they add or remove various components. However, if you do not have these instruments, you can simply do a qualitative study, using the brightness of the bulbs. The use of ammeters has also been included in this chapter. We will look at the difference between these two set-ups in circuits, specifically looking at the effects of adding resistors in series or in parallel and observing the change in brightness of bulbs. We will now examine the concept of series and parallel circuits. Up until now, we have only been looking at simple circuits. The total resistance of a parallel circuit must be less than the individual resistance of any branch resistance value in the circuit this can be explained by Ohm's law.This chapter builds on the Gr 6 and 7 electric circuits work, and the previous chapter of this book. The voltage across each component is equivalent to the voltage across all the others. Each component has different current running through it. ![]() The circuit in Figure 1 is in parallel and the lightbulbs act as the loads. A neighbour cooking dinner has no effect on someone ironing in a different house on a different circuit. Likewise, different houses in a neighbourhood are parallel. The circuit breaker or fuse itself is in series with the rest of the circuit though. That means that if one circuit gets overloaded (tripping the circuit breaker or blowing the fuse), it won't have any effect on the other circuits. Refrigerators often cause kitchen lights to dim slightly.Ĭircuit breakers and fuses have different parallel circuits. Careful observation can detect lights dimming momentarily when an additional component is turned on. This means that with ideal electrical circuits, turning on a television set usually has no effect on electric lights in the same room. The electric outlets in a house are all parallel. The electric current flowing through each component is based only on the resistance of that component, not on the other components. This makes each load (electrical component, like a hairdryer) independent. These circuits have the advantage of making each component effectively invisible to the other components. Parallel circuits provide more than one current path between any two points. ![]() As a result, they can be connected in one of two ways, in series (one electrical lead is touching the other), or in parallel (both leads are touching). Many electrical components in an electric circuit have two leads (ends). Each of the three light bulbs are in parallel. An example of a parallel circuit generated with a PhET. ![]()
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