$(a)$ Name an instrument that measures electric current in a circuit. Define unit of electric current
$(b)$ What are the following symbols mean in an electric circuit ?
$(c)$ Draw a closed circuit diagram consisting of $0.5\, m$ long nichrome wire $XY,$ an ammeter, $a$ voltmeter, four cells of $1.5\, V$ and a plug key.
$(a)$ Name an instrument that measures electric current in a circuit. Define unit of electric current
$(b)$ What are the following symbols mean in an electric circuit ?
$(c)$ Draw a closed circuit diagram consisting of $0.5\, m$ long nichrome wire $XY,$ an ammeter, $a$ voltmeter, four cells of $1.5\, V$ and a plug key.
$(a)$ An ammeter. The current is said to be one ampere if $1$ coulomb of charge flows through a cross$-$section of conductor per second.
$(b)$ $(i)$ Rheostat
$(ii)$ Plug key (closed)
$(c)$ The diagram is as shown.
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$(a)$ Resistivity of iron is $10 \times 10^{-8} \;\Omega m$ and of mercury is $94 \times 10^{-8}\; \Omega m$. Which among iron and mercury is a better conductor ? Give reason.
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$(b)$ Resistivity of a material $A$ is in the range of $10^{10}-10^{\text {14 }} \;\Omega m$ while that of $B$ is in the range of $10^{-6}-10^{-8} \;\Omega$ m. Which of the two will behave as an insulator and why?
$(a)$ Derive an expression to find the equivalent resistance of three resistors connected in series. Also, draw the schematic diagram of the circuit.
$(b)$ Find the equivalent resistance of the following circuit
$(a)$ Derive an expression to find the equivalent resistance of three resistors connected in series. Also, draw the schematic diagram of the circuit.
$(b)$ Find the equivalent resistance of the following circuit