Transcript p6pig - Macmillan Academy

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)