DP Physics (last assessment 2024)
Question 17N.2.SL.TZ0.3a.ii
| Date | November 2017 | Marks available | [Maximum mark: 2] | Reference code | 17N.2.SL.TZ0.3a.ii |
| Level | SL | Paper | 2 | Time zone | TZ0 |
| Command term | Calculate | Question number | a.ii | Adapted from | N/A |
a.ii.
[Maximum mark: 2]
17N.2.SL.TZ0.3a.ii
Electrical resistors can be made by forming a thin film of carbon on a layer of an insulating material.
A carbon film resistor is made from a film of width 8.0 mm and of thickness 2.0 μm. The diagram shows the direction of charge flow through the resistor.
(a.ii)
The film must dissipate a power less than 1500 W from each square metre of its surface to avoid damage. Calculate the maximum allowable current for the resistor.
[2]
Markscheme
power = 1500 × 8 × 10–3 × 0.032 «= 0.384»
«current ≤ »
0.068 «A»
Be aware of ECF from (a)(i)
Award [1] for 4.3 «A» where candidate has not calculated area
