Question

How do you solve resistance problems?

Answer 1

Explanation:

1. The obstruction to current flow in an electrical circuit is measured by resistance.
2. The Greek letter omega () represents the unit of measurement for resistance, known as ohms. Georg Simon Ohm (1784–1854), a German physicist who investigated the connection between voltage, current, and resistance, is the name given to the unit of resistance. Ohm's Law is attributed to him as its creator.
3. To some extent, all materials obstruct the flow of current. They can be divided into one of two categories:
4. Materials that give extremely little resistance and allow electrons to travel freely are called conductors. Silver, copper, gold, and aluminum are some examples.
   High-resistance materials known as insulators prevent the flow of electrons. Rubber, paper, glass, wood, and plastic are some examples.
5. Resistance is a measure of the opposition to current flow in an electrical circuit. Resistance is measured in ohms.
6. The property of a conductor by virtue of which it opposes the flow of electric current through it is known as resistance. It is given by the ratio of the voltage applied to the electric current which flows through it.
7. $R=\frac{V}{I}$
8. Materials that offer very low resistance are called conductors while materials that offer high resistance are called insulators. The higher the resistance lower is the flow of current. Resistance is dependent on the type of material and its dimensions (area of cross-section)
9. Resistance across a wire is also given by $R=\frac{\rho L}{A}$, where $\rho$ is the resistivity of the material, $A$ is cross-sectional area and $L$ of wire
10. When an electric current of one ampere passes through a component across which a potential difference (voltage) of one volt exists, then the resistance of that component is one ohm.

To solve resistance, apply a known DC voltage across the component, then measure the current passes through it by an ammeter, then by the ohm's law find the resistance.

In order to solve the resistance problem, apply ohm's law to calculate the resistance of the circuit, from the formula

$R=\frac{V}{I}$.

1. When the length, area of cross-section, and resistivity of the wire is given then the resistance $R=\frac{\rho L}{a}$.
2. When resistors are connected in series, then total resistance is $R=R_1+R_2+\dots$
3. When resistors are connected in series, then total resistance is $\frac{1}{R}=\frac{1}{R_1}+\frac{1}{R_2}+\dots$