Batteries 1. A 1.5V \'D, cell, a 9V battery, and a 12V car-, -- 1 battery are co

Question

Batteries 1. A 1.5V 'D, cell, a 9V battery, and a 12V car-, -- 1 battery are connected in series as shown. Calculate the total voltage. 1.5V 9.0V 12.0V 2. Calculate the number of 1.5V D' cells needed in series to produce 18V 9 0V Two 9V batteries are connected in parallel. This pair is then connected in series with a 12V battery. Calculate the total voltage. 3. 12.0V 9.0V Capacitance 4. A 100F capacitor holds 0.0 12C of charge. Calculate VC between the plates. 5. A 15V circuit needs to hold 0.0007C of charge. Calculate the capacitor required. 6. Two identical square plates 0.2m on a side form a 12nF capacitor. Calculate the spacing needed if K 4.2 is the dielectric used between them.

Explanation / Answer

1) As the combination of cell and batteries are in series

Therefore total voltage= sum of all voltages

V=1.5+9+12=22.5 V

2) Total 12, 1.5 D cells are required to produce 18V in series

3) For total voltage

First two batteries are connected in parallel then

V=1/9+1/9=2/9

And this pair is connected with 12 v battery then

V=2/9+12=110/9=12.22 V

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