Producing And Measuring Electricity

Explanation
An ammeter is used to measure the current in a circuit. It is specifically designed to measure the flow of electric current. Unlike a voltmeter, which measures voltage, or a rheostat, which is used to control resistance, an ammeter is calibrated to directly measure the current passing through a circuit. It is an essential tool for electrical engineers and technicians to ensure that circuits are functioning properly and to troubleshoot any issues related to current flow.

Explanation
Capacity refers to the measure of the amount of electrical energy that a cell can hold. It represents the maximum amount of charge that a cell can store. Volume is not the correct answer as it refers to the amount of space occupied by an object. Time is also not the correct answer as it is a measure of the duration. Amps is the unit used to measure electric current, not the measure of the amount of electrical energy that a cell can hold.

Explanation
In a circuit, electrons flow from the negative terminal to the positive terminal. Electrons are negatively charged particles and they move in response to an electric field. This flow of electrons constitutes an electric current, which is the movement of charge through a conductor. The flow of electrons from the negative terminal to the positive terminal is essential for the operation of electrical devices and the transfer of energy in a circuit.

Explanation
An LDR (Light Dependent Resistor) is a resistor that changes its resistance with changing light intensity. It is a type of sensor that is commonly used in light-sensitive devices. When exposed to light, the resistance of the LDR decreases, and when in darkness, the resistance increases. This property makes it suitable for applications such as automatic lighting control, solar panels, and light meters. Therefore, the correct answer is LDR.

Explanation
The correct answer is "Rechargeable battery" because it is a type of battery that can be used multiple times by recharging it. Unlike disposable batteries, which are used once and then discarded, rechargeable batteries can be recharged and reused, making them a more sustainable and cost-effective option.

Explanation
A field is an area found around a magnet. In the context of magnets, a field refers to the region in which the magnetic force produced by the magnet can be detected. This magnetic field extends outwards from the magnet and can interact with other magnetic objects or materials within its range. Therefore, "Field" is the correct answer as it accurately describes the area surrounding a magnet.

Explanation
When the speed of the magnet movement increases, the magnetic field passing through the coil changes at a faster rate. According to Faraday's law of electromagnetic induction, a change in magnetic field induces an electromotive force (EMF) in a coil. Therefore, an increase in the speed of the magnet movement leads to a larger induced potential difference in the coil.