# What is resistance in DC circuit?

## What is resistance in DC circuit?

Resistance, ( R ) is the capacity of a material to resist or prevent the flow of current or, more specifically, the flow of electric charge within a circuit. The circuit element which does this perfectly is called the “Resistor”.

**How do you calculate resistance in a DC circuit?**

Ohms Law and Power

- To find the Voltage, ( V ) [ V = I x R ] V (volts) = I (amps) x R (Ω)
- To find the Current, ( I ) [ I = V ÷ R ] I (amps) = V (volts) ÷ R (Ω)
- To find the Resistance, ( R ) [ R = V ÷ I ] R (Ω) = V (volts) ÷ I (amps)
- To find the Power (P) [ P = V x I ] P (watts) = V (volts) x I (amps)

**Does DC current have resistance?**

i.e. capacitive and inductive reactances in DC circuits zero because there is no frequency in DC circuits, i.e. magnitude of DC current is constant. Therefore, only the original resistance of wire comes into play.

### What is the rule for resistance in a DC series circuit?

Resistance: The total resistance of any series circuit is equal to the sum of the individual resistances. Voltage: The supply voltage in a series circuit is equal to the sum of the individual voltage drops.

**Are phones AC or DC?**

That is why portable electronics – flashlights, cell phones, laptops – use DC power; they have to store it. Because the electric grid provides AC, the electricity must get converted to DC when you want to charge a portable device.

**How are resistances calculated in AC and DC circuits?**

In DC Circuits, we calculate the resistance by Ohm’s Law. When solving electric circuits for finding resistance and you are not sure which one should you take into account whether AC or DC resistances, then, if the current passed is AC, then take AC resistance else if the current passed is DC, take DC resistance.

## What is the relationship between current and resistance?

The relationship between Voltage, Current and Resistance forms the basis of Ohm’s law. In a linear circuit of fixed resistance, if we increase the voltage, the current goes up, and similarly, if we decrease the voltage, the current goes down. This means that if the voltage is high the current is high, and if the voltage is low the current is low.

**How is the DC Circuit related to voltage?**

DC circuit can be explained as the closed path in which the direct current flows. The current of the DC circuit is flowing just in one direction. Hence, it’s mostly found in any low voltage applications with the main component is resistor. 3. Understanding the DC Circuit Theory

**How does ohm’s law relate to current and resistance?**

Ohm’s Law – How Voltage, Current, and Resistance Relate. Chapter 2 – Ohm’s Law. The first, and perhaps most important, relationship between current, voltage, and resistance is called Ohm’s Law, discovered by Georg Simon Ohm and published in his 1827 paper, The Galvanic Circuit Investigated Mathematically.