Textbook brain teaser
A 100 W appliance and a 1,000 W appliance both run for one hour. Do they use equal energy? Why?
100 W اور1,000 W آلات ایک گھنٹہ چلیں تو کیا برابر توانائی لیتے ہیں؟ کیوں؟
Solution & explanation
No. E = Pt. The first uses 0.1 kW × 1 h = 0.1 kWh and the second 1 kW × 1 h = 1 kWh. The second uses ten times the energy, assuming both operate continuously at the stated power.
Independent study material · English-medium textbook p. 121 · Original book ↗