Questions got wrong Flashcards
1
Q
A
- Wind is unreliable
- wind might be too strong/weak
2
Q
A
- Increase in efficiency
- wasted energy would decrease
- less friction
3
Q
A
- more efficient = waste less energy
- which would minimise electricity
4
Q
A
- a mean can be calculated
- which reduces effects of random errors
5
Q
A
- electrons transferred from cloth to rod
- electrons are negatively charged
- so there are more positive charges than negative on the cloth
6
Q
A
- there is an additional downwards force
- rod is negatively charged
- negative charges repel each other
7
Q
A
- only change in mass is being observed
8
Q
A
- a large potential difference between two objects
- causes negative electrons to move through the air
- from rod to conductor
9
Q
A
- to increase potential difference
- and to decrease current
- reducing thermal energy transfer to surroundings
- increasing the efficiency
10
Q
A
- Transformer Y decreases the potential difference
- to a safer value
11
Q
A
- Alpha radiation has a low penetrating ability, so alpha radiation is stopped by skin
- internally, alpha radiation is absorbed by organs
- As alpha radiation is highly ionising
- contamination will cause greater harm to cells (or higher risk of getting cancer)
12
Q
A
- S1 needs to be closed to complete the circuit
13
Q
A
- total resistance decreases
- so current increases
- which increases the power output
