Electromagnetic induction

• Electromagnetic induction can create a voltage by movement of a conductor in a magnetic field.
• The voltage created by electromagnetic induction can make current flow, and the effect is used in electricity generation and microphones.
• The potential difference (or voltage) of a supply is a measure of the energy given to the charge carriers in a circuit.
• Units for the potential difference (or voltage) are volts (V).
• The potential difference across a cell, electrical supply or electrical component is measured in volts (V).
• A potential difference (or voltage) is needed to make an electric current flow in a circuit.
• This effect occurs whether a magnet is moved into a coil, or a coil is moved around a magnet.
• As with all currents, the induced current creates a magnetic field around itself.
• The direction of the induced current depends on the direction of movement of the magnet relative to the coil.
• The current is reversed when: the magnet is moved out of the coil the other pole of the magnet is moved into the coil
• The induced voltage produces an induced current if the conductor is connected in a complete circuit.
• If a magnet is moved into a coil of wire, the induced magnetic field tends to repel the magnet back out of the coil.
• The magnetic field opposes the original change.
• A coil of wire moved in a magnetic field or a magnet moved into a coil of wire is an example of electromagnetic induction.
• The production of a potential difference (voltage) when a conductor, such as a wire, is moved through a magnetic field or exposed to a varying magnetic field is called electromagnetic induction.
• If the conductor is part of an electric circuit, an induced current will flow.
• Electromagnetic induction can create a voltage by movement of a conductor in a magnetic field.
• Electromagnetic induction is often referred to as the generator effect.
• The voltage can make current flow, and the effect is used in electricity generation and microphones.
• An alternating current (ac) generator is a device that converts kinetic energy into electrical energy.
• When motion between a conductor and a magnetic field creates electricity, as in a magnet being moved into a coil of wire, it is an example of electromagnetic induction.
• The potential difference (or voltage) of a supply is a measure of the energy given to the charge carriers in a circuit.
• The voltage between two points that makes an electric current flow between them is referred to as the voltage.
• Alternating current, such as the mains supply of electricity from a plug, is alternating current.
• An ac generator consists of a coil of wire rotating in a magnetic field.
• Cars use a type of ac generator, called an alternator.
• An electrical generator which produces alternating current, an ac generator.
• The alternator is used to keep the battery charged and to run the electrical system while the engine is working.
• The alternator produces a current that is constantly changing.
• Electromagnetic induction can create a voltage by movement of a conductor in a magnetic field.
• In position E, the coil is at 360°, having done a full rotation, and no potential difference is induced.
• The voltage produced by an ac generator follows a sine curve.
• In position D, the coil is at 270° and the induced potential difference is at its maximum.
• In position A, the coil is at 0° and no potential difference is induced.
• The output of an alternator as it rotates can be represented on a potential difference-time graph with potential difference (voltage) on the vertical axis and time on the horizontal axis.
• Alternating current or ac is the type of current that changes direction periodically.
• In position C, the coil is at 180° and no potential difference is induced.
• The shape of the graph obtained for y = sin x is a close sine curve.
• In position B, the coil is at 90° and the induced potential difference is at its maximum.
• Electromagnetic induction can create a voltage by movement of a conductor in a magnetic field.