Voltage is a measure of the electric potential difference between two points in an electric circuit. It is often referred to as the force or pressure that pushes electric charges to flow through a circuit.
Voltage is measured using a device called a voltmeter. It typically has two probes that are connected to the two points in a circuit and it displays the voltage in volts (V).
Batteries are devices that convert chemical energy into electrical energy. The voltage of a battery is determined by the chemical reactions happening inside it and is typically labeled on the battery as its voltage rating (e.g. 1.5V for a AA battery).
The voltage of a battery directly affects its performance. A higher voltage means more potential energy available to power a device, while a lower voltage can result in decreased performance or even failure to operate. It is important to use the correct voltage of batteries in electronic devices to ensure proper functioning.
Voltage in batteries cannot be manipulated, as it is determined by the chemical reactions happening inside the battery. However, multiple batteries can be connected in series or parallel to increase or decrease the overall voltage in a circuit.