Two batteries supply current to the circuit figure The figur

Two batteries supply current to the circuit figure. The figure shows the potential difference across two of the resistors and the values of the third resistor. (Figure 1) Part A What current is supplied by the batteries? Express your answer with the appropriate units.

Solution

Eeq = E1 + E2 ( batteries in series )

=> Eeq = 3+4.5 = 7.5 V

Veq = V1 + V2 + V3 ( resistances in series )

=> V3 = 7.5 - 2 - 3.5 = 2 V

=> current = V/R = 2/150 = 0.01333 Amp