Question Video: Identifying the Ammeter That Is Correctly Connected to a Bulb | Nagwa Question Video: Identifying the Ammeter That Is Correctly Connected to a Bulb | Nagwa

Question Video: Identifying the Ammeter That Is Correctly Connected to a Bulb Science • Third Year of Preparatory School

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Each of the diagrams shows an electric circuit. Which one shows how the ammeter must be connected to the circuit in order to measure the current through the bulb? [A] Option A [B] Option B [C] Option C

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Video Transcript

Each of the following diagrams shows an electric circuit. Which one shows how the ammeter must be connected to the circuit in order to measure the current through the bulb?

Before answering the question, let’s review some facts about ammeters and currents in electric circuits.

We know that an ammeter is used to measure the electric current in a wire. For an ammeter to measure the current through a component, the ammeter must be connected in series with the component and not in parallel. Remember, connecting components in series means that they are on the same path through the circuit, while connecting the component in parallel means that they are on separate paths.

Let’s look at a few more examples of components connected in parallel. Each of these may look a little bit different, but they are all examples of ammeters connected in parallel with one or more bulbs. We know that they are connected in parallel because if we draw a path from one terminal of the cell to the other terminal of the cell, the path can’t go through both an ammeter and a bulb.

We can draw some of the paths that the current could take onto the circuit diagrams. All of the pink paths pass through a bulb, and all of the green paths pass through an ammeter. But none of the paths pass through both a bulb and an ammeter. So, all of these ammeters are connected in parallel with the bulbs. This is not how ammeters should be connected.

Out of the options we’ve been given, option (A) is the only diagram that shows an ammeter connected to a bulb in series. The only path that the current can take through the circuit passes through both the ammeter and the bulb. This is the correct way to connect an ammeter.

Now that we know that ammeters should always be connected in series, we can see that option (A) is the only diagram that shows the correct way to connect an ammeter to this circuit.

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