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
When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Find the value of the resistance of the resistor.
What is an Ohmic resistor?
Find the expression for the resistivity of a material and state the SI unit of resistivity.
The unit of electrical resistance is:
(a) ampere
(b) volt
(c) coulomb
(d) ohm
The graph between V and I for a conductor is a straight line passing through the origin.
What should remain constant in a statement of this law?
- Draw a V-I graph for a conductor obeying Ohm’s law.
- What does the slope of V–I graph for a conductor represent?
In a conductor 6.25 × `10^16` electrons flow from its end A to B in 2 s. Find the current flowing through the conductor (e = 1.6 × `10^-19` C)
What is meant by the drift speed of free electrons?
Define Current density.
