Lesson test: The RC circuit and the time constant

1.[2p]
When a capacitor charges through a resistor, the charging current

starts at its largest and falls as the capacitor voltage rises

Correct

stays constant throughout

The answer is: starts at its largest and falls as the capacitor voltage rises

starts at zero and grows

The answer is: starts at its largest and falls as the capacitor voltage rises

is always zero

The answer is: starts at its largest and falls as the capacitor voltage rises

2.[1p]
The time constant of an RC circuit is

the product of the resistance and the capacitance, $R C$

Correct

the sum of the resistance and capacitance

The answer is: the product of the resistance and the capacitance, $RC$

the resistance divided by the capacitance

The answer is: the product of the resistance and the capacitance, $RC$

the capacitance alone

The answer is: the product of the resistance and the capacitance, $RC$

4.[2p]
After one time constant, what percentage of the source voltage has a charging capacitor reached? Give it to the nearest whole number.

CorrectNot quite: 63

5.[2p]
A capacitor is considered essentially fully charged after about

five time constants

Correct

one time constant

The answer is: five time constants

half a time constant

The answer is: five time constants

a hundred time constants

The answer is: five time constants

6.[3p]
Taking the output of an RC circuit across the capacitor makes a low-pass filter because

the capacitor can follow slow changes but not fast ones, so it passes the slow and rejects the fast

Correct

the resistor blocks all signals

The answer is: the capacitor can follow slow changes but not fast ones, so it passes the slow and rejects the fast

the capacitor amplifies fast signals

The answer is: the capacitor can follow slow changes but not fast ones, so it passes the slow and rejects the fast

the output is always zero

The answer is: the capacitor can follow slow changes but not fast ones, so it passes the slow and rejects the fast

7.[2p]
An RC circuit gives a circuit a memory, because the capacitor's voltage depends on all the charge that has ever flowed onto it.

True

Correct

False

The answer is: True

Sign in

The RC circuit and the time constant

1.[2p]
When a capacitor charges through a resistor, the charging current

2.[1p]
The time constant of an RC circuit is

3.[2p]
A 10 kilohm resistor charges a 100 microfarad capacitor. What is the time constant, in seconds?

4.[2p]
After one time constant, what percentage of the source voltage has a charging capacitor reached? Give it to the nearest whole number.

5.[2p]
A capacitor is considered essentially fully charged after about

6.[3p]
Taking the output of an RC circuit across the capacitor makes a low-pass filter because

7.[2p]
An RC circuit gives a circuit a memory, because the capacitor's voltage depends on all the charge that has ever flowed onto it.

1.[2p] When a capacitor charges through a resistor, the charging current

2.[1p] The time constant of an RC circuit is

3.[2p] A 10 kilohm resistor charges a 100 microfarad capacitor. What is the time constant, in seconds?

4.[2p] After one time constant, what percentage of the source voltage has a charging capacitor reached? Give it to the nearest whole number.

5.[2p] A capacitor is considered essentially fully charged after about

6.[3p] Taking the output of an RC circuit across the capacitor makes a low-pass filter because

7.[2p] An RC circuit gives a circuit a memory, because the capacitor's voltage depends on all the charge that has ever flowed onto it.

1.[2p]
When a capacitor charges through a resistor, the charging current

2.[1p]
The time constant of an RC circuit is

3.[2p]
A 10 kilohm resistor charges a 100 microfarad capacitor. What is the time constant, in seconds?

4.[2p]
After one time constant, what percentage of the source voltage has a charging capacitor reached? Give it to the nearest whole number.

5.[2p]
A capacitor is considered essentially fully charged after about

6.[3p]
Taking the output of an RC circuit across the capacitor makes a low-pass filter because

7.[2p]
An RC circuit gives a circuit a memory, because the capacitor's voltage depends on all the charge that has ever flowed onto it.