Generators Mrs. Brostrom Integrated Science C

Generators II. Magnetism can create electricity – A moving conductor (wire) in a magnetic field generates electrical current in the conductor Or wire is still and magnet is moving Movement is critical!

Generators III. Magnetism can create electricity Called electromagnetic induction – Electrical current is “induced” Used in generators – Transfers mechanical energy into electrical energy Uses: – Gas powered generators » Gas engine turns rotor – Power plants » Coal, natural gas, or garbage burned → steam – Wind turbine or hydroelectric dam » Turbines power generators

Generators Generators are similar to motors ◦Converts mechanical energy into electrical energy ◦The loop of wire inside turns within a magnetic field and thus produces a current ◦For each half rotation of the loop, the current produced by the generator reverses direction Produces AC (alternating current)

Generators 1. Can be AC (alternating current) ◦Power plants 2. Can be DC (direct current) ◦Hand generator

Draw a series and parallel circuit. What is the advantage of a parallel circuit?

Electricity Review

What is the relationship between current, voltage, and resistance?

How does a light bulb work?

Whiteboard Electricity Review 1. How do electromagnets work? 2. Give an example of an electromagnet in your house

Whiteboard Electricity Review 1. Identify a source of electricity and the energy transfer associated with it. 2. Identify a transfer from electricity to something else seen in the classroom.

Whiteboard Electricity Review 1. Why do light bulbs give off light? 2. Why do light bulbs give off heat?