Why must circuit breaker be hooked in series with a line of appliance even though the line of appliances are hooked together in parallel?
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Appliances in parallel: if one appliance fails, the remaining appliances won’t be affected, and can continue operating.
Circuit breaker in series: if the appliances draw too much current, the wire in the wall can melt and start a fire. Easy to just cut current to the whole circuit, instead of needing additional wiring to monitor (or fully power) each outlet or appliance.
A circuit breaker placed in parallel is useless. It would just short-circuit the line and cause itself to trip, but without protecting the rest of the circuit.
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