Is there an easy way to know what the voltage polarity across a resistor must be? For example, in the circuit that I drew here: http://www.folderol.net/circuit.jpg
How do I know where the plus and minus go on either side of the resistor R? I get different values of R depending on what the polarity is and the current directions that I choose...
Also, can all of the currents that join at the top node be going away from that node? Or does at least one current have to be going toward the node?
Thanks.
How do I know where the plus and minus go on either side of the resistor R? I get different values of R depending on what the polarity is and the current directions that I choose...
Also, can all of the currents that join at the top node be going away from that node? Or does at least one current have to be going toward the node?
Thanks.