Physics Practical exam for grade 12 2019 - 20 - Experiment five PDF

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Summary

RESISTANCE...

Description

Al – Injaz Private School Physics Practical Exam for Grade 12, Semester One - Academic year 2019/2020 Student's name: ........................................................................ Time: 20 min Date: / 12/2019

Mark:

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Read carefully the information given below for this experiment and make sure that all the required tools and materials are in front of you Correction will be as follows: Initiating and planning .........................................................................2 marks Implementation and recording ............................................................3 marks Analysis and interpreting ..................................................................... 5 marks

Experiment number (5) - Problem:

A student wants to find the the internal resistance of the power supply. Based on the relationship between voltage and current through an ohmic conductor and using the tools in front of you, help the student to find the internal resistance of the supply. Planning & Initiating:

(2 marks)

1.Design a circuit diagram for the experiment to help the student solve the problem.

2.Predict what will happen to the slope of a graph of (V against I) if a power supply of double internal resistance was

1

(1½)

Used.

(½)

…………………………………………………………………………......................................................................................................................... .....................................................................................................................................................................................................

Implementation & Recording: (Note: switch off the circuit after the readings are (recorded)

Trials

Current in the circuit. (I/mA)

Potential difference

(3 marks)

(V/ Volt)

1 2 3 4 5 6

Analyzing & interpreting:

(5 marks)

1. Plot the graph of voltage (V) against current (I). ……………………………………………………………………………………….....(2) 2. Using your graph: (a) What does the value on the y-axis intercept represent?

(1)

……………………………….............................................................................................................................................. …………………………………………………………………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………………………………………………………………… .. (b) Calculate the internal resistance (r) of the power supply.

(2) .

…………………………………………………………………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………………………………………………………………

2

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3...