CHEM 112 Chapter Notes -Voltmeter, Ocz, Density
Document Summary
Part a: conceptual questions: if we connect them in series, req = 300w. If we connect them in parallel, req = 30 w. Therefore, in order to obtain a 150 w and in series . Connecting two in parallel: req1 = 50 w. Connecting req1 in series with r: req = 150 w resistance, we have to connect the resistors in parallel: c) the wire has essentially zero resistance, compared to the light bulb, and is in parallel with it. Thus, almost all charge flows through the wire, and practically none through the bulb: circuit 1: f) the potential difference across the branch of the circuit containing the switch is zero. Thus, there is no current through it when the switch is closed, and nothing changes. Circuit 2: f) because the light bulbs are identical, the potential difference across each is 12 v, and so nothing happens with the switch is closed: using the circuit, dimmer e)