# Current and voltage across resistors

• master_mind
In summary, the effect on current flow and voltages across resistors is different for resistors connected in series and resistors connected in parallel. In a series circuit, the current is the same across all resistors, while in a parallel circuit, the voltage is the same across each resistor.

#### master_mind

The effect on current flow and voltages across resistors for
- resistors connected in series
- resistors connected in parallel

can anyone help me and tell me the diffrences?

Welcome to PF!

Hi master_mind! Welcome to PF!

In one case, the current is the same; in the other case, the voltage is the same.

Which way round do you think it is, and why?

is it that in the series circuit the current is the same across all resistors, and on the parallel circuit the voltage is the same across each resistor.

thanks

That's what it is.

## 1. What is the relationship between current and voltage across resistors?

The relationship between current and voltage across resistors is described by Ohm's Law, which states that the current through a conductor is directly proportional to the voltage and inversely proportional to the resistance. This means that as the voltage increases, the current also increases, but as the resistance increases, the current decreases.

## 2. How is the voltage across a resistor calculated?

The voltage across a resistor can be calculated using Ohm's Law, which states that voltage (V) is equal to current (I) multiplied by resistance (R). This can be written as V = IR. Therefore, if the current and resistance values are known, the voltage can be calculated by multiplying them together.

## 3. What is the unit of measurement for current and voltage?

The unit of measurement for current is amperes (A), and the unit of measurement for voltage is volts (V). These units are named after the scientists who discovered their relationship - André-Marie Ampère and Alessandro Volta.

## 4. How does the voltage across a resistor affect the flow of current?

As mentioned before, the voltage and current have a direct relationship, meaning that the higher the voltage, the greater the current flow. This is because a higher voltage provides more energy to push the electrons through the resistor, resulting in a higher current.

## 5. What factors can affect the voltage and current across a resistor?

The voltage and current across a resistor can be affected by the resistance of the material, the length and thickness of the resistor, and the temperature of the resistor. Additionally, the voltage and current can also be affected by the type of power source and any external factors such as magnetic fields or other electronic components.