1. If the voltage across a 1.2-k? resistor is 3.6 V, what is the current (in mA) flowing through it?
2. A 1.5-V battery is connected in series with a 3.3-k? resistor, a 4.7-k? resistor, and a 1.0-k? resistor. Calculate the current (in mA) through and the voltage (in V) across each resistor.
3. What is the effective resistance of a series combination of a very large resistance and a very small resistance? First try 10 k? and 10 ?, rounding the answer off to two significant figures, to get a feel for what is happening, and then state the general rule for finding the result given any large and small resistances, not necessarily these exact two values. If used as a voltage divider connected across a 1.5-V battery, approximately what will be the potential drop across each resistor?