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One kilowatt hour is equal to

Asked in CBSE AIPMT 1997 · Units of electrical energy

• (1) 36×10⁻⁵ J
• (2) 36×10⁻⁴ J
• (3) 36×10⁵ J
• (4) 36×10³ J

Step-by-step solution

Why the other options are wrong

• (1) Right mantissa but the exponent's sign flipped; a kilowatt hour is a large energy, not a tiny one.
• (2) No single slip gives this value; it is 10⁹ times too small and even has the wrong sign of exponent.
• (4) No single slip gives this value; 3.6×10⁴ J is a hundredth of the true value.

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