Design a simple battery tester that could handle AAA, AA, C, and D cells. Use at

Question

Design a simple battery tester that could handle AAA, AA, C, and D cells. Use at most one meter (the testers have just one analog display) and show interior elements and wiring. Are there any resistors inside the tester? If so, should they have a large or small resistance? Should the meter, resistor(s), and battery be hooked in series or parallel with each other? (Hint: Think about what you saw varying most between good and dead batteries.) SHOW YOUR CIRCUITRY HERE Tester is inside.this box LACE What kind of meter Ammeter or Voltmeter (circle one) (meter leads) Any resistance circuitry you want to add goes here. Be sure that your meter and battery are connected appropriately to whatever goes in this box. Battery to be tested The meter is within the shaded gray box within the tester and has all attributes of a normal meter of that type... if you pick an ammeter, it will inherently have a small resistance; if you pick a voltmeter, it will inher- ently have a large resistance... and those resistances will nof need to be shown as part of your circuit Explain briefly how your tester works. What measurement from the front page are you effectively making? The Potientel difftne is measoree BONUS: Some meters have the capability to test 9V batteries too. They have different leads for the 9V bat- teries that fit the battery's contacts. The meter you selected above would be the same, with the same maxi- mum value (full-scale deflection). What, if anything, would need to be different about the interior circuitry for testing the 9V battery? In another color on the diagram above add the extra circuitry and leads (connec- tions out of the tester) needed to check a 9 V battery

Explanation / Answer

Hi,

In this case, I think that the first part that you answered is right. I would also use a resistor of known resistance inside the circuit and a voltmeter to measure the difference in potential through it, provided that all the material in this circuit follow Ohm's Law. Besides, I would compare the parameters calculated with the known parameters of standard batteries.

If we have a battery of higher voltage we could do nothing, leaving the same resistor, but this will increase the voltage through it, and said voltage could be out of the scale. To solve this problem, I would suggest changing the resistor for another one with a proportionally bigger resistance.

I hope it helps.

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