Physics

Water Heating Calculator

Find the energy needed to heat water.

Calculated Output

Energy needed (J) 334,880

Energy needed (Wh) 93.022

Formula: Q = m·c·ΔT (c = 4186 J/kg·K)

Step-by-Step Breakdown

1. Values used:

2. Mass of water = 1

3. Temperature rise = 80 K

5. Energy needed = 334,880J

6. Energy needed = 93.022Wh

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The math behind it

Q = m·c·ΔT, with water's specific heat c = 4186 J/(kg·K).

Boiling 1 kg of water from 20 °C → about 335 kJ (93 Wh).

Why do kettles draw so much power?

Water's high specific heat needs lots of energy delivered quickly.