What would you invent to make school easier or more fun?
Area of Interaction/área de interacción
ATL. Homofaber. Health and social education
Aims/objetivos
Students will be able to:
Describe a magnetic field due to a straight current carrying wire and a solenoid. Describe an experiment to show that a force acts on a current carrying wire and effects of reversing current and field. State that a current carrying coil experiences a turning force and increasing the turns increases the force. Relate the turning effect of a coil of wire to that of an electric motor. Show that changing a magnetic field in a circuit can produce an e.m.f. Describe a rotating –coil generator and use of slip rings. Sketch a voltage output against time for an a.c. generator. Describe the construction of a basic iron –cored transformer. Describe the use of a transformer for high voltage transmission and its advantage.
Content/contenido
Describe the effect on the magnetic field of changing magnitude of the current. State and use the relative directions force, field and current. Use the equation F = BIL. Describe the effect of increasing current and field on a motor. Describe the force experienced by charged particles in magnetic fields. Use the equation F = Bqv. State the factors affecting the magnitude on an induced e.m.f. and that the direction of the e.m.f opposes the change causing it. Describe the principle operations of a transformer. Use equations Vp/Vs = Np/Ns and VpIp =VsIs. Use the equation P = I2R in relation to power loss in cables
