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Description
Flashcards by Monika Rhys-Jones, updated more than 1 year ago
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Created by Monika Rhys-Jones
over 9 years ago
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| Question | Answer |
| What is created when current flows through a wire? | a magnetic field |
| A magnetic field can be strengthened by | -adding an iron core -adding more coils in wire -increasing the current (adding more cells) |
| What can a low current circuit be used to do? | switch on a high current circuit |
| How is a low current circuit used to switch on a high current circuit? | using an electromagnet in a relay circuit |
| How can an electromagnet be used in a circuit breaker? | if there's a high current, it flows through the electromagnet, which then attract a metal part of the circuit, and break it |
| What does each finger represent in Fleming's left hand rule? | Thumb - movement Index finger - direction of magnetic field Middle finger - direction of current |
| In what direction is a magnetic field? | North to South |
| What direction does current flow in? | positive to negative |
| How can the force of the movement of the wire be increased? | -increasing the current -increasing the magnetic field |
| How can the movement of the wire be reversed? | -reversing magnetic field OR -reversing the current |
| How does a motor work? | -both sides of circuit between magnets -have opposite movements of current -wire move in opposite directions on either side of the circuit -creates a turning effect |
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