Define electric current and state its $SI$ unit. With the help of $Ohm's$ law explain the meaning of $1$ ohm resistance
Define electric current and state its $SI$ unit. With the help of $Ohm's$ law explain the meaning of $1$ ohm resistance
It is defined as the rate of flow of electric charge through an electric circuit.
Its $SI$ unit is ampere $(A).$
$Ohm's$ law is $V=I R$
Let $V =1 ohm$ and $I =1$ ampere, then $R =1$ volt $/ 1$ ampere $=1\, ohm$
Thus, $1$ $ohm$ is the resistance of a conductor, if under the effect of a potential difference of $1$ volt across it a current of $1$ ampere flows through it.
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$(a)$ What do the following symbols represent in a circuit ? Write the name and one function of each.
$(b)$ Draw a schematic diagram of a circuit consisting of a battery of $12 V$, three resistors of $5\, \Omega, 10\, \Omega$ and $20\, \Omega$ connected in parallel, an ammeter to measure the total current through the circuit, $a$ voltmeter to measure the potential difference across the combination of resistors.
$(c)$ State any one advantage of connecting electrical devices in parallel with the mains instead of connecting them in series in a household circuit.