Identify the statements that are true: (A) Charge becomes used up as it flows through a circuit (B) Charge flows through circuits at very high speeds (C) A light bulb transforms the electrical energy of moving charge into other forms of energy (D) The charge carriers in wires are simply the electrons possessed by the atoms that make up the wires
(C) and (D)
Statement (A) is false because charge is conserved in a circuit; it is the electrical energy of the charge that gets converted into other forms, not the charge itself.
Statement (B) is false because although the electric field driving the current is set up almost instantaneously, the actual charge carriers (electrons) drift through the conductor at a very slow drift speed, not at very high speeds.
Statement (C) is true because a light bulb converts the electrical energy carried by the moving charge (electrons) into light and heat energy.
Statement (D) is true because in a metallic wire, the charge carriers are the free electrons that belong to the atoms making up the wire itself; the battery does not supply new electrons, it only provides the energy needed to make the existing electrons move.
Hence, statements (C) and (D) are correct.
Important Questions from Current Electricity
Which of the following is a bad conductor of electricity?
In general, in an alternating current circuit
The laws of electromagnetic induction have been used in the construction of a
A 220 volt and 100 watt bulb is connected to a 110 volt source. The power consumption by the bulb is
Which of the following statement is correct?
I. 1 kWh = 3.6 × 10 6J.
II. The SI unit of electric current is the ampere.
