Video Transcript
The diagram shows an electric
circuit. How many ammeters are there in the
circuit?
In this question, we are shown a
diagram of an electric circuit, and we’re asked to count the number of ammeters. We can see that there are a lot of
components in this circuit, but here we’re only interested in finding the number of
ammeters. First, let’s talk about what an
ammeter is. An ammeter is a device that when
inserted into a circuit measures the current through the circuit. The current is the flow of charge
around a circuit. In circuit diagrams, each type of
component has its own symbol. This makes it much easier for
anyone to identify each symbol when looking at the diagram. The symbol for an ammeter is a
circle with a capital A in the center, A for ammeter.
Let’s go around the circuit,
starting from the positive terminal of the cell, and count the number of times we
see this symbol. There’s one here, here, here, and
here. After looking over each component,
we can see that there are four ammeters in this circuit. So four ammeters is the correct
answer.
