# Battery, emf , r, and voltage

• Libra_girl
In summary, the conversation discussed the emf and internal resistance of a torch battery and asked for the voltage measurement when connected to a bulb drawing 0.5 A. The person then thanked the helpers for the solution and suggested adding "[SOLVED]" to the thread title for future reference.
Libra_girl

## Homework Statement

A torch battery has an emf of 6.0V and an internal resistance of 1 Ohms. What is the voltage measured by a voltmeter connected across the terminals of the battery, when the battery is connected to a bulb that draws 0.5 A from the battery?

Anyways thanks I solved it.

Last edited:
For future reference, if you're satisfied that you've figured out the problem and are satisfied with the answer, edit your thread title to include the word "[SOLVED]" at the start of it. This will let the helpers know that you're all right and they won't need to open your zero-reply thread. Thanks!

## 1. What is a battery?

A battery is a device that converts chemical energy into electrical energy. It typically consists of one or more electrochemical cells connected together to produce a voltage and supply power to electrical devices.

## 2. What is emf?

Emf stands for electromotive force, which is the amount of electrical energy that a battery can supply to an external circuit. It is measured in volts (V) and is essentially the force that pushes the electrons through the circuit.

## 3. What is the difference between emf and voltage?

Emf is the potential difference between the two terminals of a battery when it is not connected to a circuit, while voltage is the potential difference between two points in a circuit. Emf is the maximum voltage a battery can produce, while voltage is the actual potential difference experienced in a circuit.

## 4. What is the role of resistance (R) in a circuit?

Resistance is a measure of the opposition to the flow of electric current in a circuit. It is caused by factors such as the material of the wire, its length, and its cross-sectional area. Resistance reduces the amount of current that can flow through a circuit and is measured in ohms (Ω).

## 5. How do I calculate voltage in a circuit?

Voltage can be calculated by using Ohm's Law, which states that voltage (V) equals current (I) multiplied by resistance (R). This can be written as V = IR. Voltage can also be calculated by using a voltmeter to measure the potential difference between two points in a circuit.

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