(A) A voltage source, a resistor and a switch
(B) A voltages source and a conductor
(C) A power source and a bulb
(D) A voltage source, a conductor an ammeter and a switch
(A) A voltage source, a resistor and a switch
(B) A voltages source and a conductor
(C) A power source and a bulb
(D) A voltage source, a conductor an ammeter and a switch
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