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Physics, 05.02.2020 02:57 Savannahpeeler1001
The efficiency of a device such as a lamp can be calculated using this equation:
efficiency = (useful energy transferred ÷ energy supplied) × 100
using the formula, calculate the efficiency of the lamp shown in the diagram above.
a) 7%
b) 25%
c) 70%
d) 75%
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