Advertisements
Advertisements
प्रश्न
A car bulb connected to a 12 volt battery draws 2 A current when glowing. What is the resistance of the filament of the bulb? Will the resistance be more same or less when the bulb is not glowing?
Advertisements
उत्तर
Potential Difference/Voltage (V) = 12 V
Current (I) = 2 A
Resistance (R) = ?
According to Ohm's Law:
V = IR
Then R = `"V"/"I"`
R = `12 / 2`
R = 6 Ω
Resistance will be less when the bulb is not glowing.
APPEARS IN
संबंधित प्रश्न
Will current flow more easily through a thick wire or a thin wire of the same material, when connected to the same source? Why?
An electrical bulb is marked 200V, 100W. Calculate the electrical resistance of its filament. If five such
bulbs are connected in series to a 200V supply, how much current will flow through them?
Name the unit of electrical resistance and give its symbol.
Calculate the effective resistance across AB?
What is meant by the drift speed of free electrons?
What is non ohmic device?
Obtain the macroscopic form of Ohm’s law from its microscopic form and discuss its limitation.
Assertion: The statement of Ohm’s law is K = IR.
Reason: V = IR is the equation which defines resistance.
Suppose there is a circuit consisting of only resistances and batteries and we have to double (or increase it to n-times) all voltages and all resistances. Show that currents are unaltered. Do this for circuit of Example 3.7 in the NCERT Text Book for Class XII.
