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AQA · GCSE · Physics · Higher

Completing an LED Characteristic Graph

Q03.3 3 marks

Table 1 shows the results when the potential difference across the LED had positive values.

Table 1
Potential difference in volts0.01.01.82.02.22.42.6
Current in milliamps0005194169

Figure 4 shows a graph of current against potential difference.

Complete Figure 4.

  • plot the remaining points from Table 1
  • draw a line of best fit

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Marking points

  1. 1 Plots at least three of the four remaining data points accurately.
  2. 2 Plots the fourth remaining data point accurately, so all four are correct.
  3. 3 Draws a suitable line of best fit through the trend.

Why this answer loses marks

Plots every point but joins them dot to dot.

The final mark needs a suitable best-fit line, not a point-to-point join.