A typical LED converts electrical energy into light with efficiency around
A. 80-90%
B. 10%
C. 50-60%
D. 100%
Answer: Option A
Solution (By JKSSB Mock Tests)
LEDs are highly efficient, converting ~80-90% of electrical energy into light, rest heat. Incandescent bulbs ~10% efficient. LED long life, low power. Blue LED Nobel prize 2014.
Explanation:
Galvanometer is sensitive instrument for detecting presence and direction of small currents. Ammeter measures larger currents. Voltmeter potential difference. Wattmeter power.
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