Chapter 18 - Basic Electric Circuits - Learning Path Questions and Exercises - Exercises - Page 653: 5

a). $30ohms$ b). $0.3A$ c). $1.4Watts$

We have in the circuit resistors 5ohms, 10ohms, and 15 ohms in series with a battery 9V. a). Equivalent resistance = $5+10+15=30ohms$ b). Current in each resistor = $9/30=0.3A$ c). Rate at which energy is delivered to 15 ohm resistor = $I^{2}R=0.3^{2}\times 15=1.4Watt$