Redraw the circuit of 9.39, putting in an ammeter to measure the current through the resistors and a voltmeter to measure the potential difference across the 12Omega resistor. What would be the readings in the ammeter and the voltmeter ?

Redraw the circuit of 9.39, putting in an ammeter to measure the curre

1.	Redraw the circuit of 9.39, putting in an ammeter to measure the current through the resistors and a voltmeter to measure the potential difference across the 12Omega resistor. What would be the readings in the ammeter and the voltmeter ?
Answer» Solution :The circuit DIAGRAM of above with an ammeter A and a voltmeter Vacross `12Omega` resistor is shown in figure CALCULATION of current flowing in the circuit : Equivalent resistance of the circuit, `R_s = 5Omega + 8 Omega + 12 Omega = 25 Omega` In a series combination, the current flowing through each resistor is the same and equal to the TOTAL current flowing through the circuit. `:.` Current through the resistors, `I + V/R` `= 6/25` `= 0.24 A` Since the current in the circuit and the current through each resistor is the same, the ammeter will show a reading of 0.24 A. Calculation of potential difference across 122 resistor : As total current 0.24 A flows in the circuit, the same current 0.24 A would also flow through the 122 resistor which is connected in series. `:.` The potential difference across the 12 12 resistor, `V = IR` ` = 0.24 xx 12 = 2.88 V` Thus, the p.d. across `12 Omega` resistor is 2.88 volt. So, the voltmeter will show a reading of 2.88 V.