DP Physics (last assessment 2024)
Question 21M.2.SL.TZ1.d.ii
| Date | May 2021 | Marks available | [Maximum mark: 2] | Reference code | 21M.2.SL.TZ1.d.ii |
| Level | SL | Paper | 2 | Time zone | TZ1 |
| Command term | Calculate | Question number | d.ii | Adapted from | N/A |
d.ii.
[Maximum mark: 2]
21M.2.SL.TZ1.d.ii
A mass of 1.0 kg of water is brought to its boiling point of 100 °C using an electric heater of power 1.6 kW.
The electric heater has two identical resistors connected in parallel.
The circuit transfers 1.6 kW when switch A only is closed. The external voltage is 220 V.
Calculate the power transferred by the heater when both switches are closed.
[2]
Markscheme
use of parallel resistors addition so Req = 15 «Ω» ✓
P = 3200 «W» ✓
