The series circuit above contains three resistors and two batteries.
Each resistor is labeled with an "R," the symbol for resistance. In
addition, each "R" is followed with a numeral to identify the
specific resistor (R1, R2, etc.). The batteries are identified in a
containing two or more components, it becomes necessary to use
subscripts to identify specific values. Subscripts are numbers or
letters written below and to the right of the original circuit
function letter, as in IR1 or ER3 (I R1 is read "I sub R1"). Total
circuit values are normally identified with a subscript "t." Total
voltage, total current, and total resistance are identified as Et, It,
How many paths for current flow are there in a series circuit?