Advertisements
Advertisements
Question
What changes in energy occur in an electric bulb?
Advertisements
Solution
In an electric bulb, electrical energy changes to heat and light energy.
RELATED QUESTIONS
Name the quantity whose unit is kilowatt?
An electric motor takes 5 amperes current form a 220 volt supply line. Calculate the power of the motor and electric energy consumed by it in 2 hours.
Write the formula for electric power in terms of potential difference and current.
An electric bulb is rated 250 W, 230 V. Calculate:
- the energy consumed in one hour
- the time in which the bulb will consume 1.0 kWh energy when connected to 230 V mains.
A resistor of resistance R is connected to an ideal battery. If the value of R is decreased, the power dissipated in the resistor will ______________ .
What is the energy conversion when an electric current passes through a metallic wire?
The equation I2R seems to suggest that the rate of heating in a resistor is reduced if resistance decreases, whereas equation P = V2/R suggests just the opposite. How do you reconcile this problem?
The unit of e.m.f. of a cell is ____________.
Compare the power used in the 2 Ω resistor in each of the following circuits:
- a 6 V battery in series with 1 Ω and 2 Ω resistors
- a 4 V battery in parallel with 12 Ω and 2 Ω resistors.
What is the commercial unit of electrical energy? Represent it in terms of joules.
