Question Video: Identifying Circuit Components That Can Provide a Potential Difference | Nagwa Question Video: Identifying Circuit Components That Can Provide a Potential Difference | Nagwa

# Question Video: Identifying Circuit Components That Can Provide a Potential Difference Science • Third Year of Preparatory School

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The diagram shows an electric circuit containing a cell and a bulb. Which component in the circuit provides an electric potential difference?

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### Video Transcript

The diagram shows an electric circuit containing a cell and a bulb. Which component in the circuit provides an electric potential difference?

Here, we are shown a diagram of an electric circuit with components consisting of a cell, wire, and a bulb. We’re asked which of these components provide the electric potential difference to the circuit. First, let’s remind ourselves what we mean by potential difference. Recall that a current is the flow of electrons around a circuit. Whenever electrons are being made to move from one point to another, we can say that there’s a potential difference between these points. Only certain devices can produce an electric potential difference. One of the most common devices that produces a potential difference is a cell.

A cell is made up of two terminals, one positive and one negative. In a cell, electrons are effectively pushed out of the negative terminal so that they move around the circuit and move into the positive terminal. This is how a cell provides a potential difference to a circuit. So we know that a cell can provide a potential difference to a circuit. Let’s briefly think about the other options.

Although electrons travel through wires in a circuit, the wire itself does not produce a potential difference. If there is no cell connected to the wires, the electrons in the wires will not move. In order for a bulb to light up, there must be a potential difference across the bulb. However, the bulb itself does not provide this potential difference. This potential difference must be provided by another device, like a cell.

So the only device in this circuit that can provide a potential difference is the cell. This is our answer to the question.

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