🔍 Key Concepts

• Trace the current path for each switch position in circuit 'B' (series, single, parallel). • Think about what an open-circuited heating element does to the rest of the circuit. • Compare how much total resistance (and therefore heat output) you get when elements are in series vs parallel.

💭 Think About

• For the low-heat (series) setting, if one of the two elements is open, can current still flow through the other one? What does that do to heat output? • For the medium-heat (single) setting, which physical element (upper or lower) is actually connected in the diagram? If the upper one is burned out, does the remaining element still have a complete circuit? • For the high-heat (parallel) setting, if one branch is open and the other branch is intact, what does the total power output look like compared with normal and with medium heat?

✅ Before You Answer

• Carefully identify which symbol in circuit 'B' represents the upper element and which represents the lower element in every switch position. • Confirm in each switch position whether there is a continuous path from L1 to L2 through at least one good element. • Compare the resulting number of active elements and their configuration to decide if the oven produces no heat, low heat, or medium heat for each switch position.