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## Physics Tutorials

### Fuel Injectors and Solenoids

#### Solenoid

1- A current-carrying coil of wire that acts like a magnet when a current passes through it.

2- An assembly used as a switch consisting of a coil and a metal core free to slide along the coil axis under the influence of a magnetic field.

Explanation: A wire is wrapped around a tube. Then a magnet , or a piece of metal, is placed inside the tube. Electric current is placed through the wire and a magnetic field is formed and moves the inner object out. You can move the inner object in and out by changing the direction of the electricity through the wire. This will cause the magnetic field direction to change direction.

#### Fuel Injectors

Fuel injectors are electronically controlled valves that supply pressurized fuel to your intake manifold directly at the intake valves. It is capable of opening and closing many times per second. When a fuel injector is energized (electricity applied), an electromagnet moves the plunger that opens the valve allowing pressurized fuel to squirt out through a tiny whole. When not energized a spring pushes the plunger back down and allows no fuel to exit. The amount of opening of the plunger is regulated by the amount of electricity sent to the fuel injector causing the magnetic field to be stronger.

#### Question

Where else are solenoids used to control fluid flow?

Answer: Washing machines, dishwashers.

electromagnetic induction problems

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