Three 2V cells are connected in series and used as a battery in a circuit.
What is the p.d. at the terminals of the battery?
How many joules of electrical energy does 1C gain on passing through
One cell.
All three cells?
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If three cells of 2 volt each are connected in series to make a battery, then the total potential difference between terminals of the battery will be 6V.
Given: p.d. = 2V, Charge moved = 1C
We know that
Work done = p.d × charge moved
= 2 × 1
Work done = 2 joules
Given: p.d = 6V, Charge moved = 1C
Work done = p.d × charge moved
= 6 × 1
Work done = 6 joule.
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An electric bulb is rated as 10W, 220V. How many of these bulbs can be connected in parallel across the two wires of 220V supply line if the maximum current which can be drawn is 5A?
Calculate the area of cross-section of a wire if its length is 1.0m, its resistance is $23 Ω$ and the resistivity of the material of the wire is $1.84\times10 Ω\ \text{m}.$
What will be the resistance of a metal wire of length $2$ metres and area of cross-section $1.55 \times 10m $, if the resistivity of the metal be $2.8 \times 10 m?$
The electrical resistivities of four materials P, Q, R and S are given below:
$\begin{matrix}\text{P}&6.84\times10^{-8}\Omega\text{m}\\\text{Q}&1.70\times10^{-8}\Omega\text{m}\\\text{R}&1.0\times10^{15}\Omega\text{m}\\\text{S}&11.0\times10^{-7}\Omega\text{m}\end{matrix}$
Which material will you use for making: