A resistor, capacitor, and switch are all connected in series to an ideal battery of constant terminal voltage. Initially, the switch is open. What is the voltage across the resistor and the capacitor at the moment the switch is closed?

The voltage across the resistor and the capacitor at the moment the switch is closed is D. The voltage across the resistor is equal to the terminal voltage of the battery, and the voltage across the capacitor is zero.

Voltage refers to the difference in electric potential that's between two points. It is also known as the electric potential difference or the electric tension.

Regarding the question, it should be noted that as the switch is closed, then the capacitor will charge through the resistor. When the switch is closed, the voltage across the resistor will be equal to the terminal voltage. Also, the voltage that's across the capacitor will be equal to zero.

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annyksl annyksl · Answer 2 · 2021-11-04T11:26:03+01:00

When the switch is closed, the voltage across the resistor is equal to the voltage found at the end of the battery, while the voltage across the capacitor is equal to zero.

We can arrive at this answer because:

Voltage refers to the difference in electrical potential between two elements.
The moment the system switch is closed, the capacitor starts to be electrically charged.
This charging is done through the resistor.
However, the moment the switch is closed, the voltage across the resistor will be equal to the final voltage of the charging battery.

For all this to happen, the voltage across the capacitor must be zero.

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