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Transcript
Explain how the resistance changes for both these semi conductors Light dependent Resistor (LDR) Thermistor Explain how the motor works, including the job of the commutator (4) N Coil of wire S Commutator: Explain how the motor will be affected by more light shining on the LDR (3) M Moving the magnet into the coil produces a current Name two ways to produce a higher current Two waves of producing a current in the opposite direction (4) N How/ why are transformers used in the national Grid (4) What will the output voltage be? (explain your answer (3) 12V 12 ohms 6 ohms 0V V (out) Explain how a bistable or latch gate works works (3) SET output RESET Explain how a dynamo works (3) N S Iron core Coil of wire Complete the truth tables OR Gate AND Gate Input 1 Input 2 output Input 1 Input 2 output 0 0 ? 0 0 ? 1 0 ? 1 0 ? 0 1 ? 0 1 ? 1 1 ? 1 1 ? Explain how to calculate the secondary voltage Primary volts 12V 50 turns Secondary volts = ? 150 turns Explain what diodes do to alternating current, including the difference between half and full wave rectification Why will the alarm go off if the temperature of the thermister is high enough (3) V in Output to alarm 0V To improve the efficiency of commercial motors the coil is cylindrical. Explain why, including the name of the field produced. (2) Why are diodes and capacitors combined when ac is being converted to dc current (1) Why are relays often used with logic gates? (2)
