Advertisements
Advertisements
प्रश्न
An electric bulb is rated at 220 V, 100 W.
- What is its resistance?
- What safe current can be passed through it?
उत्तर
- Given,
Power P = 100 W
Voltage V = 220 V
As power, P = `"V"^2/"R"`
R = `(220)^2/100`
= 484 Ω - The safe limit of current that can pass through it
I = `"P"/"V"`
I = `100/220`
= 0.45 A
APPEARS IN
संबंधित प्रश्न
Three 2 V cells are connected in series and used as a battery in a circuit.
What is the p.d. at the terminals of the battery?
Ten bulbs are connected in a series circuit to a power supply line. Ten identical bulbs are connected in a parallel circuit to an identical power supply line.
(c) In which circuit, if one bulb blows out, all other will stop glowing?
Two resistors of 2.0 Ω and 3.0 Ω are connected (a) in series (b) in parallel, with a battery of 6.0 V and negligible internal resistance. For each case draw a circuit diagram and calculate the current through the battery.
State the relation between work, charge and potential difference for an electric circuit.
Tick (✓) the correct choice among the following :
(a) A strong short bar magnet is dropped into a solenoid connected to a
galvanometer as shown in fig . The galvanometer shows a deflection to the left when the current in the coil as seen from above is counter clockwise. Which one of the following shows the correct deflection of the galvanometer when the magnet is at posi tions A, Band C.
The SI unit for electric current is the coulomb.
