Question

Draw a schematic diagram of a circuit consisting of a battery of three cells of 1.5V each, a plug key, a 4Ω resistor, a 6Ω resistor and an 8Ω resistor all connected in parallel.Connect an ammeter to measure the current across the 8Ω resistor and a voltmeteracross all three resistors to measure the voltage, what would be the readings of the ammeter and

Answer 1

Answer:

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Answer 2

Given :

EMF of each cell of the battery consisting of three cells = 1.5 V

Resistances of the resistors connected in parallel to this battery :

$4\Omega , 6\Omega , 8 \Omega$

An ammeter is connected across the 8 ohm resistor .

A voltmeter across all the three resistors .

To Find :

What are the readings of the ammeter and the voltmeter for the given set up  = ?

Solution :

The circuit diagram is shown in the attached figure .

Since we have to measure current across the 8 ohm resistor , the ammeter will be connected in series with the 8 ohm resistor .

Now  to find the reading of the ammeter :

∴$I = \frac{V}{R}$

    = $\frac{3\times 1.5}{8}$

    = $\frac{4.5}{8}$

 $I = 0.5625 A$

And the reading of voltmeter is :

= $1.5 \times 3$

= 4.5 V

Hence the reading of ammeter is 0.5625 A and reading of voltmeter is 4.5 V .