ALTERNATIVE B (a) You are provided with a variable DC power supply E, a key, an ammeter, a voltmeter and other necessary materials (i) Set up a circuit as s...
Question 1 Report
ALTERNATIVE B
(a) You are provided with a variable DC power supply E, a key, an ammeter, a voltmeter and other necessary materials
(i) Set up a circuit as shown in the diagram above with E = 3.0V
(ii) Close the key.
(iii) Record the voltmeter reading, V
(iv) Read the corresponding ammeter reading, I
(v) Evaluate V\(^{-1}\) and I\(^{-1}\)
(vi) Repeat the procedure for the four other values of E = 4.5V, 6.0V, 7.5V and 9.0V.
(vii) Tabulate your readings.
(viii) Plot a graph with I\(^{-1}\) on the vertical axis and V\(^{-1}\) on the horizontal axis starting with both axes from the origin. (0, 0)
(ix) Determine the slope, s of the graph.
(x) Also, determine the intercept, c on the vertical axis
(xi) What does the slope, s represent?
(xii) State two precautions taken to ensure accurate results.
(b) State two methods by which an electric current can be produced
(i) State Ohm's law.
Answer Details
(vii)
| E(V) | V(V) | I(A) | V\(^{-1}\)(V\(^{-1}\)) | I\(^{-1}\)(I\(^{-1}\)) |
| 3.00 | 2.86 | 1.43 | 0.350 | 0.699 |
| 4.50 | 4.28 | 2.14 | 0.234 | 0.467 |
| 6.00 | 5.70 | 2.86 | 0.175 | 0.350 |
| 7.50 | 7.14 | 3.57 | 0.140 | 0.280 |
| 9.00 | 8.57 | 4.28 | 0.117 | 0.234 |
(viii) SEE THE GRAPH ABOVE
(ix) Slope = \(\frac{Δ I^{-1}}{Δ V^{-1}}\) = \(\frac{0.6 - 0.3}{0.3 - 0.15}\) = \(\frac{0.3}{0.15}\) = 2
(x) Intercept, c = 0.01
(xi) Slope, s represents external resistance of the circuit
(xii) I. I ensured tight connections II. I avoided error due to parallax on the ammeter/voltmeter
b(i) I. Use of cell II. hydropower
(ii) Ohm's law states that the current passing through a metallic conductor is directly proportional to the potential difference applied at both ends provided temperature remains constant.
Download The App On Google Playstore
Everything you need to excel in your exams
