In the circuit shown, A & C are identical light bulbs, and B is a different bulb. It's a 1.5 V battery. 5a. If we add another bulb, D, of the same type as A & C, into the same line as C, what will the potential difference across it be? Why? 5b. Explain whether bulb D will be brighter, dimmer or the same as bulb C and why. A B 6a. If the potential difference across bulb A is 1V, then what is the potential difference across bulb B? Explain why. 6b. Will bulb A will be brighter, dimmer or the same as bulb B under the simplifying (but impossible) assumption of 100% efficient bulbs where all the energy is output to the environment as light and not heat. Explain why. 6c. What, if anything, changes about your previous answer if bulb B is 100% efficient while bulb A is 50% efficient (so its energy leaves half as light and half as heat). Explain why.

In the circuit shown, A & C are identical light bulbs, and B is a different bulb. It's a 1.5 V battery. 5a. If we add another bulb, D, of the same type as A & C, into the same line as C, what will the potential difference across it be? Why? 5b. Explain whether bulb D will be brighter, dimmer or the same as bulb C and why. A B 6a. If the potential difference across bulb A is 1V, then what is the potential difference across bulb B? Explain why. 6b. Will bulb A will be brighter, dimmer or the same as bulb B under the simplifying (but impossible) assumption of 100% efficient bulbs where all the energy is output to the environment as light and not heat. Explain why. 6c. What, if anything, changes about your previous answer if bulb B is 100% efficient while bulb A is 50% efficient (so its energy leaves half as light and half as heat). Explain why.