RRB Group D practice question
An electric heater of 2 kW is used for 3 hours. How many units (kWh) of electrical energy does it consume?
From a RRB Group D Science practice set · Science
Tap an option to check your answer.
Show answer and explanation
Correct answer: (B) 6 units
Energy = power × time = 2 kW × 3 h = 6 kWh = 6 units. The kilowatt-hour is the energy unit counted by household meters; dividing (2 ÷ 3) or adding (2 + 3) gives the wrong options.
हिंदी में प्रश्न
2 kW का एक विद्युत हीटर 3 घंटे चलाया जाता है। यह कितनी यूनिट (kWh) विद्युत ऊर्जा खर्च करता है?
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (B) 6 यूनिट
ऊर्जा = शक्ति × समय = 2 kW × 3 h = 6 kWh = 6 यूनिट। किलोवाट-घंटा घरेलू मीटर द्वारा गिनी जाने वाली ऊर्जा का मात्रक है; भाग या जोड़ करने से गलत विकल्प बनते हैं।
More solved Science questions
- Ramu has been given a tub of water with a refractive index of 1.33, a mug of oil with a refractive index of 1.46, a bottle of glycerine…
- Standing up and supporting the lower back with hands, then gently arching back and holding this posture for some time is called as:
- Which of these is a protein-rich food?
- According to Newton's Third Law of Motion, every action force has an equal and opposite:
- Amit had invested same amount of sums at simple as well as compound interest, compounded annually. The time period of both the sums was 2…
- A force of 10 N moves an object through a distance of 5 m in the direction of the force. Find the work done.