Advertisements
Advertisements
प्रश्न
Show by a diagram how two resistors R1 and R2 are joined in parallel. Obtain an expression for the total resistance of the combination.
Advertisements
उत्तर
On applying Ohm's law to the two resistors separately, we further
Have
`"I"_1 = "V" / "R"_1`
`"I"_2 = "V" / "R"_2`
`"I" = "I"_1 + "I"_2 `
`"V"/"R" = "V"/"R"_1+ "V"/"R"_2`
`1/"R"=1/"R"_1+1/"R"_2`
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?
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?
How should the two resistances of 2 ohms each be connected so as to produce an equivalent resistance of 1 ohm?
Define Current density.
What is non ohmic device?
The resistance of a nichrome wire at 0°C is 10Ω. If its temperature coefficient of resistivity of nichrome is 0.004/ °C, find its resistance of the wire at boiling point of water. Comment on the result.
A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1, R2 and R3 respectively. Which of the following is hue?
Let the resistance of an electrical device remain constant, while the potential difference across its two ends decreases to one fourth of its initial value. What change will occur in the current through it? State the law which helps us in solving the above stated question.
How is electric current related to the potential difference across the terminals of a conductor?
Draw a labelled circuit diagram to verify this relationship.
