Advertisements
Advertisements
Question
What is the resistance of an appliance rated at V volt, P watt?
Solution
Let I be the current drawn by the appliance.
Then Power, P = V × I or I = `"P"/"V"`
Now, Resistance R = `"V"/"I"`
Hence, R = V + `"P"/"V" = "V"^2/"P"`.
APPEARS IN
RELATED QUESTIONS
The unit for expressing electric power is:
(a) volt
(b) joule
(c) coulomb
(d) watt
What is the current in the circuit shown (Fig. )
Point out two main disadvantages of ‘Tree System’.
Two lamps are rated 220V, 50W and the other rated 220V, 100W are connected in series with the mains of 220 V. Explain, why the 50W lamp glows more?
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.
Using a long extension cord in which each conductor has a resistance of 8Ω, a bulb marked as '100 W, 200 V' is connected to a 220 V dc supply of negligible internal resistance as shown in the figure. The power delivered to the bulb is ______ W.
