Chapter 10 - Electrical Resistance Flashcards
1
Q
Which of these is the correct symbol for a thermistor (1)
A
D
2
Q
Explain why the student places the thermistor in a beaker of water. (2)
A
- it acts as water bath
- gives more gradual heating or cooling
- protects the thermistor against direct heating/prevents intense heating
3
Q
A
B
4
Q
Why is the max temperature in the student’s investigation limited to 100 degrees?
A
- Water boils at 100 degrees
5
Q
Suggest how a student should obtain readings below room temperature (1)
A
- use ice
6
Q
State the equation linking power, current and voltage (1)
A
power = current x voltage
7
Q
Calculate the power of Lamp L. [assume the mains voltage is 230V] (2)
A
230 x 0.26 = 60W
8
Q
Calculate the amount of energy transferred in 3 minutes [current being 0.26, voltage being 230 V] (3)
A
Power = current x voltage
0.26 x 230 = 60 W
energy transferred = power x time
60 x 180 = 10800 J
9
Q
A
yes
no
no
yes
10
Q
Suggest where this circuit would be useful in a house (1)
A
- bedroom/kitchen light
