Electricity and Electromagnetism - AS91173 Flashcards
Electric Field
A region where a charged object experiences a force. ALWAYS run positive to negative
Voltage
Potential difference
Power
Rate at which electrical energy is converted into another form of energy
Right-hand grip rule
Magnetic field = fingers
Current = Thumb
Right-hand slap rule
Field direction = fingers
Direction of force = ‘slap’
Current = Thumb
Induced voltage in a straight conductor
Voltage can be induced across the ends of a straight end conductor by moving the conductor through a magnetic field (and at right angles to the field)
THE DIRECTION OF CURRENT IS THE LEFT HAND SLAP RULE
If charged particles are in an electric field…
Positive particles move towards the negative plate
Negative particles move towards the positive plate
(E=Eqd)
In an arc
Conventional current flows
From positive to negative though this is NOT the flow of the electrons
Current in series
Equal in all places
Voltage in series
Adds to supply voltage
Current in parallel
Splits, but combines just before returning to the supply
Voltage in parallel
Equal in all places
Magnetic Field travels from
North to South
Adding a resistor in parallel
Causes total circuit resistance to decrease
Adding resistor in series
Causes total circuit resistance to increase
Voltmeters are added in…
…parallel
Ammeters are added in…
…series
When is voltage induced…
…a static conductor is situated within in a changing magnetic field or a conductor moves within a static magnetic field
THE MOTOR EFFECT (I FOUND IT)
A wire carrying a current creates a magnetic field. This can interact with another magnetic field, causing a force that pushes the wire at right angles. Results in movement of wire. Occurs as long as the current is at right angles to the magnetic field.
Electromagnetic Induction
Movement of a wire (or a magnet) creates an electric current. The size of the induced voltage will increase if: the strength of the magnet is increased. Wire must be inside the field.a changing magnetic field induces an electric field, which results in the induced voltage.
