# What will be the potential difference?

• Acez
In summary, a Grade 9 student is seeking help with a physics question regarding an ammeter and voltmeter. The question was posted in the wrong section and the student is reminded to follow the posting guidelines in the Homework and Coursework Section. The student is also advised to show their own efforts before receiving help.
Acez
This is my first time on Physics Forum, so if I post this question at the wrong place please don't be annoyed.

I am a Grade 9 student and I came upon this question and don't know how to solve it:

An ammeter gives a reading of 5A when a switch was closed for 20 seconds. If this battery has 1000C of charge, what would the voltmeter read?

1. This question belongs in the Homework and Coursework Section, under Introductory Physics. <it will get moved there>

I am happy to see your interest in physics and your willingness to seek help when you encounter a challenging question. The potential difference, also known as voltage, can be calculated using the formula V = I*t/Q, where V is the potential difference, I is the current, t is the time, and Q is the charge.

In this case, we know that the ammeter reading is 5A and the time is 20 seconds. We also know that the battery has 1000C of charge. Plugging these values into the formula, we get V = (5A * 20s)/1000C = 0.1V. Therefore, the voltmeter would read 0.1V.

I hope this helps you understand how to solve this problem. Keep up your curiosity and enthusiasm for science!

## 1. What is potential difference?

Potential difference, also known as voltage, is the difference in electric potential energy between two points in an electric circuit. It is measured in volts (V).

## 2. How is potential difference calculated?

Potential difference is calculated using Ohm's law, which states that the potential difference (V) is equal to the current (I) multiplied by the resistance (R). In equation form, this is written as V = I x R.

## 3. What is the unit of measurement for potential difference?

The unit of measurement for potential difference is the volt (V). It can also be expressed in millivolts (mV) or kilovolts (kV), depending on the magnitude of the difference.

## 4. What factors affect potential difference?

Potential difference is affected by the amount of current flowing through a circuit, as well as the resistance of the circuit. It is also affected by the type of material used in the circuit, as different materials have different electrical properties.

## 5. Why is potential difference important?

Potential difference is important because it is the driving force that allows electricity to flow through a circuit. It determines the flow of current and is essential for the functioning of electrical devices and systems.

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