$(a)$ Name the instrument/device used to measure electric current in a circuit.
$(b)$ How is an ammeter connected in a circuit to measure current flowing through it ?
$(a)$ Name the instrument/device used to measure electric current in a circuit.
$(b)$ How is an ammeter connected in a circuit to measure current flowing through it ?
$(a)$ Ammeter
$(b)$ In series.
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The equivalent resistance in series combination is
The equivalent resistance in series combination is
Two bulbs are marked $60\, W , 220\, V$ and $100\, W$, $220\, V$. These are connected in parallel to $220\, V$ mains. Which one out of the two will glow brighter ?
Two bulbs are marked $60\, W , 220\, V$ and $100\, W$, $220\, V$. These are connected in parallel to $220\, V$ mains. Which one out of the two will glow brighter ?
$(a)$ For the circuit shown in the diagram, calculate
$(i)$ value of current through the $30\, \Omega$ resistor.
$(ii)$ total resistance of the circuit.
$(b)$ Give two advantages of connecting electrical devices in parallel with battery.
$(a)$ For the circuit shown in the diagram, calculate
$(i)$ value of current through the $30\, \Omega$ resistor.
$(ii)$ total resistance of the circuit.
$(b)$ Give two advantages of connecting electrical devices in parallel with battery.
$(a)$ 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.
$(a)$ 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.