electromag induction

Question 1

Electromagnetic induction

Answer 1

• when a conductor’s magnetic field interacts with another magnetic field, voltage is induced
• strength of potential difference depends on:
  → strength of mag field
  → rate of cutting
  → turns in the coil

Question 2

Generator

Answer 2

• coil is rotated within a magnetic field
• as it turns the coil cuts the magnetic field lines
• this induces a voltage/current in the coil
• this can be connected to an existing circuit
• KE to Electrical E

Question 3

Transformer

Answer 3

• AC current in primary coil
  → produces a changing magnetic field around said primary coil
• Iron core channels(amplifies) changing field, through to the secondary coil
• voltage is induced in secondary coil

Question 4

Step up and down transformers

Answer 4

• Step up Ts inc voltage, more SECONDARY turns than primary
• Step down Ts dec voltage, more PRIMARY turns than secondary
  (self explanatory, more to less v is more prim than sec turn)

Question 5

Voltage and turns ratio

Answer 5

Vp/Vs = Np/Ns

Voltage over voltage = turns over turns