Pencil lead is a conductor or an insulator experiment

Option One:

The necessary equipment: ammeter, pencil lead, battery, a number of wires, switches

Experimental method: the ammeter, pencil lead, battery, switch (disconnect when connected) followed by a wire connected together to form a series circuit. And then close the switch to see whether the ammeter pointer deflection, if the deflection is the conductor; if not deflected, it is insulator.

Option II:

Required equipment: a small light bulb, pencil lead, battery, a number of wires, switches

Experimental method: a small light bulb, pencil lead, battery, switch (disconnect when connected) in turn connected together by a wire to form a series circuit. And then close the switch, observe the bulb, if the light bulb, it is conductor; if not bright, it is insulator.

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