RC Circuits

Immediately after the switch is closed, the voltage across the 3uF capacitor is

• 0 V
• 45 V
• 22.5 V
• 45e^-t/RC V

Immediately after the switch closes, the current in the circuit is

• 0 A
• 45 microAmps
• 22.5 microAmps
• 45e^-t/RC microAmps

The time constant for this circuit is

• 0
• 3 seconds
• 3 microseconds
• 0.33 seconds

After the switch is closed, the voltage across the capacitor is

• 45(1 - e^-t/RC)
• 45(e^-t/RC)

After the switch is closed, the current is 

• 0.000045(1-e^-t/RC)
• 0.000045e^-t/RC

When the capacitor is fully charged, the voltage across the capacitor is _________ and the current in the circuit is _________.

• 45 V, 0 A
• 0 V, 45 microA
• 22.5 V, 45 micro A
• 3 microV, 0 A

Tags

NGSS.HS-PS2-5

What are the 5 time constants?

• .0044s, .0088s, .0132s, .0176s, .022s

• .044s, .088s, .132s, .176s, .22s

• .44s, .88s, 1.32s, 1.76s, 2.2s

• .00044s, .00088s, .00132s, .00176s, .0022s

Which graph best represents the voltage versus time across the resistor R?

• A

• B

• C

• D

• E

Which graph best represents the current versus time in the circuit?

• A

• B

• C

• D

• E

The formula for calculating charge on a capacitor in charging circuit is