In this experiment you will investigate the heating of water. You are provided with: - a power supply - a switch - an ammeter - a voltmeter - an arrangement of resistors to act as a heater. The supervisor has set up the circuit shown in Fig. 1.1. (a) Close the switch. Record the current $I$ and the voltage $V$. $I$ = \_\_\_\_\_\_ $\text{A}$ $V$ = \_\_\_\_\_\_ $\text{V}$ Open the switch. (b) You are also provided with: - a beaker of water held in a clamp, boss and stand - a…

Physics 5054/32 — May/June 2020

Cambridge O-Level · Practical Test · worked solutions for every part, with the mark scheme

questions

marks

120

minutes

Topics Observations and Measurements · Experimental Contexts · Use of Techniques, Apparatus and Materials · Analysis, Conclusions and Evaluation

Q15MObservations and MeasurementsExperimental ContextsUse of Techniques, Apparatus and MaterialsAnalysis, Conclusions and EvaluationFree sample

In this experiment you will investigate the heating of water.

You are provided with:

The supervisor has set up the circuit shown in Fig. 1.1.

Fig. 1.1

(a)

Close the switch.

Record the current $I$ and the voltage $V$ .

$I$ = ______ $\text{A}$
$V$ = ______ $\text{V}$

Open the switch.

(b)

You are also provided with:

Draw a diagram in the space provided on page 3 to show how this apparatus is arranged to measure the temperature of the water.

(c)

Measure and record the temperature $\theta_1$ of the water.

$\theta_1$ = ______ $^\circ\text{C}$

Remove the thermometer from the water.

Place the heater in the water.

Close the switch and start the stop-watch.

Open the switch at time $t = 200\ \text{seconds}$ .

Remove the heater from the water.

Replace the thermometer in the water. Gently swirl the water until the reading on the thermometer stops increasing.

Measure and record the temperature $\theta_2$ of the water.

$\theta_2$ = ______ $^\circ\text{C}$

Calculate the temperature change $\theta_2 - \theta_1$ .

$\theta_2 - \theta_1$ = ______ $^\circ\text{C}$

(d)

(i)

Calculate the electrical energy $E_e$ supplied to the heater, given that $E_e = V I t$ .

$E_e$ = ______ $\text{J}$

(ii)

Calculate the thermal energy $E_T$ gained by the water. Use the equation:

E_T = m c (\theta_2 - \theta_1)

where $m = 50\ \text{g}$ and $c = 4.2\ \text{J / (g }^\circ\text{C)}$ .

$E_T$ = ______ $\text{J}$

3 more questions

Q2Experimental Contexts · Use of Techniques, Apparatus and Materials · Observations and Measurements · Analysis, Conclusions and Evaluation5M
Q3Experimental Contexts · Observations and Measurements · Use of Techniques, Apparatus and Materials · Analysis, Conclusions and Evaluation5M
Q4Observations and Measurements · Experimental Contexts · Analysis, Conclusions and Evaluation · Use of Techniques, Apparatus and Materials15M

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