Electromagnetic Effects

Worked examples (3)

• 1Field direction around a straight wire
• 2Solenoid polarity and increasing field strength
• 3Electromagnet vs. permanent magnet — advantages and disadvantages

Worked examples (3)

• 1Calculating force on a conductor
• 2Applying Fleming's left-hand rule
• 3Factors affecting the size of the force

Worked examples (3)

• 1Explaining how a DC motor works
• 2Factors affecting motor speed and torque
• 3Comparing DC motor and AC generator

Worked examples (3)

• 1Explaining the output waveform of an AC generator
• 2Peak and RMS voltage
• 3Effect of faster rotation on generator output

Worked examples (3)

• 1Demonstrating electromagnetic induction
• 2Lenz's law — direction of induced current
• 3Factors affecting induced EMF

Worked examples (3)

• 1Calculating output voltage using turns ratio
• 2Using the power equation for an ideal transformer
• 3Why the National Grid uses high voltage