How does power vary with resistance?

The power dissipated in a resistor is given by P = V2/R which means power decreases if resistance increases. Yet this power is also given by P = I2R, which means power increases if resistance increases.

Does resistance increase with power?

When power increases, the resistance will also increase keeping current I constant. When Resistance decreases, Power also reduces keeping current I constant.

Does wire resistance change with current?

The relationship between resistance and the area of the cross section of a wire is inversely proportional . When resistance is increased in a circuit , for example by adding more electrical components , the current decreases as a result.

What is the relationship between power voltage and resistance?

Power is P=IV. You can only relate it to resistance if you decided to fix one and replace the other by Ohm’s law. Ohm’s law states that voltage across a resistor is linearly proportional to the current flowing through it, or V=IR. This can be arranged to say that current is inversely proportional to voltage, or I=VR.

Is power equal to resistance?

From here, we can see that the power P is inversely proportional to the resistance R. When the power in the circuit is high, resistance will be lesser. However, if the power is low, the resistance will be high.

Does less resistance mean more power?

In a load with low resistance, the current will be high. In a load with high resistance, the current will be low. Since you have assumed that the voltage across both are same, the obvious answer is load with the lower resistance will consume more power.

What happens to power in a circuit when resistance increases?

The current is directly proportional to the voltage and inversely proportional to the resistance. This means that increasing the voltage will cause the current to increase, while increasing the resistance will cause the current to decrease.

What happens when resistance is varied?

The variable resistor is a resistor that controls (increase or decrease) the flow of electric current when we vary or change its resistance. In other words, when we vary the resistance of the variable resistor, the electric current flowing through it will increase or decrease.

How do you find resistance from power?

Power can also be calculated using either P = IV or P=V2R P = V 2 R , where V is the voltage drop across the resistor (not the full voltage of the source). The same values will be obtained.

Is higher or lower resistance better?

Resistance measurements are normally taken to indicate the condition of a component or a circuit. The higher the resistance, the lower the current flow. If abnormally high, one possible cause (among many) could be damaged conductors due to burning or corrosion.

What are four things affect the resistance of a wire?

LENGTH OF WIRE

THICKNESS OF WIRE

TEMPERATURE

TYPE OF METAL

What affects the resistance of a wire?

There are four factors that affect the resistance of a wire: This means that the ‘electric slope’ that makes the electrons move gets less steep as the wire gets longer, and the average drift velocity of electrons decreases. The correct term for this ‘electric slope’ is the potential gradient.

How do you calculate the resistance of a wire?

Theoretically it is using the formula R=Ro*l/A where R is the resistance of the wire,l is its length and A is the area of cross section. Ro is the resistivity. Ro=R*A/l. If you want to measure resistivity practi ally, you have to first find the resistance of the wire using ‘metre bridge’ technique.

What increases resistance in a wire?

Decreasing the resistivity of the material the wire is composed of will increase the resistance of the wire. Increasing the resistivity of the material the wire is composed of will increase the resistance of the wire. Increasing the length of the wire will increase the resistance of the wire.