मराठी

Write Different Expressions for Electric Power (P), Using V, I and R.

Advertisements
Advertisements

प्रश्न

Write different expressions for electric power (P), using V, I and R.
संख्यात्मक
Advertisements

उत्तर

P = VI = IR = `"V"^2/"R"`

shaalaa.com
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 4: Electricity and Magnetism - Exercise 4.2 ii [पृष्ठ १८८]

APPEARS IN

फ्रँक Physics Part 2 [English] Class 10 ICSE
पाठ 4 Electricity and Magnetism
Exercise 4.2 ii | Q 25 | पृष्ठ १८८

संबंधित प्रश्‍न

Which uses more energy: a 250 W TV set in 1 hour or a 1200 W toaster in 10 minutes?


Write the SI units for:
(a) Electric current

(b) Potential difference

(c) Charge.


Two bulbs are marked 60 W, 220 V and 60 W, 110 V respectively. Calculate the ratio of their resistance.

What is the energy conversion when an electric current passes through a metallic wire?


Two electric lamps each rating 100 W, 110 V are connected in series to a 220 V power supply and two other electric lamps each of marking 100 W, 220 V are connected in parallel to the same power supply. Will anyone of the two combinations give more light than the other? Give a reason for your answer.


What is the order of current drawn by appliances connected to the ‘light circuit’ of a household?


A bulb is connected to a battery of e.m.f. 6V and internal resistance 2Ω A steady current of 0.5A flows through the bulb. Calculate the total energy supplied by the battery in 10 minutes.


A bulb is connected to a battery of e.m.f. 6V and internal resistance 2Ω A steady current of 0.5A flows through the bulb. Calculate the heat energy dissipated in the bulb in 10 minutes.


A bulb is marked 100W, 220V and an electric heater is marked 2000 W, 220 V.
(i) What is the ratio between the resistances of these two devices?
(ii) How does the power-voltage rating of a device help us to decide about the type of leads (connecting wires) to be used for it?
(iii) In which of the above two devices, a thicker connecting wire of lead is required?


Two bulbs are rated: bulb A 100W, 120 V bulb B 10W, 120 V. If both are connected across a 120V supply, which bulb will consume more energy, When in series? Also calculate the current through each bulb in above cases.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×