To calculate the efficiency of the lamp, we need the values for "useful energy transferred" and "energy supplied." Unfortunately, without those specific values from the diagram (which I can't see), I can’t perform the calculation accurately.
However, I can show you how to use the formula with hypothetical values.
For instance, if the useful energy transferred is 70 joules and the energy supplied is 100 joules, you would calculate the efficiency as follows:
\[ \text{efficiency} = \left(\frac{\text{useful energy transferred}}{\text{energy supplied}}\right) \times 100 \] \[ \text{efficiency} = \left(\frac{70}{100}\right) \times 100 = 70% \]
So, if you can provide the specific values for useful energy transferred and energy supplied from the diagram, I would be happy to calculate the efficiency for you.
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