Chapter 23 . Electric Current. The flow of charge in an electric circuit is much. like the flow of water in a system of pipes. different than water flow in pipes. like an electric valve. like an electric pump. The flow of charge in an electric circuit is much.
Explanation: Although current can consist of protons and ions, in a copper wire current consists of electrons appropriately called conduction electrons.
Explanation: Voltage causes the flow of electrons, and doesn’t flow. Charges flow. A battery is a source of energy, not electrons.
Explanation: This is straight-forward Ohm’s law. Current = voltage/resistance.
Explanation: Although a diode will convert ac to dc, the additional use of a capacitor produces steadiness (as Figure 23.11 in the text shows).
Explanation: The electric field in a circuit travels at nearly the speed of light, not the electrons nor the current.
Explanation: Electric power = current voltage. Doubling both current and voltage corresponds to 4 times as much power.
Comment: More about LEDs in Chapter 30.
Comment: It is important to know that the current in the devices in series is also the current in the battery. Current will depend on battery resistance, but if there’s 2 A in the circuit, there’s 2 A in the battery!
Explanation: Current in the battery will be the sum of currents in the two branches.