Chapter 25. Electric Circuits. Direct Current. When the current in a circuit has a constant direction, the current is called direct current Most of the circuits analyzed will be assumed to be in steady state , with constant magnitude and direction
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ΔV = ε – Ir
ε = ΔV + Ir
= IR + Ir
ε = ΔV + Ir= IR + Ir
I = ε / (R + r)
Req = R1 + R2+ …
What resistance should you place in parallel with a 56-kΩ resistor to make an equivalent resistance of 45 kΩ?
I1 = I2 + I3
The figure shows a portion of a circuit used to model muscle cells and neurons. All resistors have the same value R = 1.5 MΩ, and the emfs are ε1 = 75 mV, ε2 = 45 mV and ε3 = 20 mV. Find the current through ε3, including its direction.
q = Q (1 – e -t/RC )
q = Qe -t/RC
An uncharged 10-µF capacitor and a 470-kΩ resistor are in series, and 250 V is applied across the combination. How long does it take the capacitor voltage to reach 200 V?