Three resistors of resistances R1, R2 and R3 are connected as shown in Fig. 1.1.
The potential difference across the resistors are V1, V2 and V3. The current in the combination of resistors is I.
Show that the total resistance R of the combination is given by the equation.
Three resistors are placed in a circuit with a cell of 10 V and negligible internal resistance and two switches S1 and S2. This is shown in Fig 1.1.
Position of switches | ||
S1 | S2 | Total resistance / kΩ |
open | closed | |
closed | open | |
closed | closed |
The cell has an e .m .f of 10 V and negligible internal resistance.
Calculate the current from the cell when
Using your answers in part (c), determine the current from the cell if just switch S2 is closed.
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