3 votes

Why does voltage reading increase the greater the resistance load?

Your circuit is a voltage divider and behaves exactly as expected. Nothing special about one resistance being called "internal battery resistance". The circuit theory doesn't care very much ...
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2 votes

Why does voltage reading increase the greater the resistance load?

If you had an ideal battery (ie without R1), then you would measure the same voltage whatever the load (resistors R4 and R5). For a real battery, with an internal resistance, you can think of it as an ...
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  • 2,621
1 vote

Automatic dark detector: base voltage

The resistor divider calculator only applies if the NPN's base-emitter doesn't clamp the voltage. However it does - so you can calculate that R2 runs 9-0.7 V, or 83 uA. The 2 MΩ LDR 'removes' 0.7/2M ...
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  • 12.5k
1 vote

What is the purpose of the parallel resistor at the end of this amplifier circuit?

Voltage divider formed with R1 and R2. The voltage after should be 8.35mV. Which is quite below the specs (1.7V), since a single supply is in use, and not too far from the input voltage offset (and ...
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  • 6,169
1 vote

how to map 1V - 10V to 1.6V to 3.2V for voltage regulation using TL494

When you're mapping one voltage range to another there's a scaling factor and an offset. Take the range of the voltages you're converting from, you've stated two different ranges, 10-100 and 1-10, we'...
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  • 3,707

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