What is an ammeter? How is it connected in a circuit? Draw a diagram to illustrate your answer.
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Ammeter is a device used for the measurement of electric current. It is always connected in series with the circuit in which the current is to be measured.
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Two resistances when connected in parallel give resultant value of $2$ ohm; when connected in series the value becomes $9$ ohm. Calculate the value of each resistance.
The electrical resistivities of three materials P, Q and R are given below:$\begin{matrix}\text{P}&2.3\times10^{3}\Omega\text{ m}\\\text{Q}&2.63\times10^{-8}\Omega\text{ m}\\\text{R}&1.0\times10^{15}\Omega\text{ m}\end{matrix}$
Which material will you use for making:
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:
Two exactly similar electric lamps are arranged (i) in parallel, and (ii) in series. If the parallel and series combination of lamps are connected to 220V supply line one by one, what will be the ratio of electric power consumed by them?