Comprehensive Questions | Chapter 14 | Current Electricity | Physics 10th | National Book Foundation

9. What is electric power? Derive its different formulae? 10. Define kWh (kilowatt hour). What is its relation with joule? How can you calculate energy in kWh by a formula? 11. Differentiate between direct current and alternating current? Define the following terms for AC: (i) Cycle (ii) Time period (iii) Frequency 12. What is function of galvanometer, ammeter and voltmeter? How are they connected in the circuits? What is reason of your selection of connecting mode of these devices in the circuit? 13. How is electricity supplied to houses by electricity department? And how do we distribute it in our household circuits? 14. What do you mean by terms short circuit and open circuit? What do you mean by live wire, neutral wire and earth wire in household circuit? 15. Describe briefly the hazards of household electricity? Describe for safety measures that should be taken in connection with the household circuit.