Electricity — Power and Energy
Science · Grade 10 · Week 22 · 25 questions
Electricity powers modern life — from phones to cities. Understanding circuits, current, voltage, and resistance helps you grasp how electrical devices work.
What you'll practise
- Draw and interpret simple circuit diagrams
- Calculate current, voltage, and resistance
- Distinguish between series and parallel circuits
- Understand conductors and insulators
All 25 questions in this Electricity — Power and Energy quiz
Grade 10 Science — Electricity — Power and Energy: 25 practice questions with instant scoring and explanations.
- Electric power is defined as:
- The SI unit of electrical power is:
- Power formula P = VI. If V = 220V and I = 5A, then P is:
- Power can also be calculated as:
- If I = 2A and R = 10Ω, power dissipated using P = I²R is:
- If V = 100V and R = 20Ω, power using P = V²/R is:
- Electrical energy is calculated as:
- If power is 100W and time is 10 hours, energy consumed is:
- 1 kWh equals:
- A device consumes 500W for 2 hours. Energy used in kWh is:
- In household circuits, resistors are connected in:
- A fuse is used to:
- MCB (Miniature Circuit Breaker) operates by:
- Earthing in household circuits is used to:
- The neutral wire in household circuit is:
- A 60W bulb and 100W bulb both glow for 10 hours. Which consumes more energy?
- Electrical energy cost is based on:
- If electricity rate is Rs. 5 per kWh, cost of 500W appliance for 4 hours is:
- Heating effect of electric current is given by:
- In an electric heater, energy is converted to:
- A bulb rated 100W, 200V is connected to 100V supply. Power consumed is:
- The power factor in AC circuits is:
- An appliance with resistance R dissipates more heat when:
- A heater of resistance 20Ω draws current of 5A for 2 hours. Heat generated is:
- The color code for neutral wire in standard household wiring is:
Question 1 of 250 correct so far