How Does Resistance Affect Current

Resistance is an independent variable ohm s law.

How does resistance affect current. Define negative and positive temperature coefficients. Ignore ohm s law and assume that current and voltage remain the same even when you change the resistance. For this reason the quantities of voltage and resistance are often stated as being between or across two points in a circuit. Voltage equals current times resistance however reducing voltage and or current does reduce power which reduces temperature.

If resistance rises current falls and vice versa. Although the resistance of a conductor changes with the size of the conductor e g. How does the resistance affect the current in a circuit. For your reference actually current doesn t affects the resistance.

Describe the effect of temperature on the resistance of an insulator. The amount of current in a circuit depends on the amount of voltage and the amount of resistance in the circuit to oppose current flow. Resistance is an independent variable ohm s law. 1 answer mark c.

Resistance is the property of an object and resistivity is the property of the substance of which the object is made. Thicker wires have less resistance to current flow than thinner wires. How does changing resistance affect power in a circuit. 1 volt flowing through 1 ohm of resistance produces 1 ampere of current.

V i x r. Resistance is pure and is not affected by frequency with the ac impedance of a resistance being equal to its dc resistance and as a result can not be negative. Voltage equals current times resistance however reducing voltage and or current does reduce power which reduces temperature. Ohm s law gives current as a ratio of voltage to resistance.

You can calculate the resistance of the filament by rearranging the equation. This is given from. When you are decreasing the resistance this current value is going up. How temperature changes resistance.

Sep 25 2017 current is inversely proportional to the resistance. Using the formula p i r where i current and r resistance what scientific explanation could i provide for the results that i obtain. Non linear resistance does not obey ohm s law but has a voltage drop across it that is proportional to some power of the current. Beyond these core electrical concepts there is a practical distinction between the two varieties of current.

So the resistance is 120 ohms. Some current is direct and some current is alternating and this is a very important distinction. What happening is resistance is affecting the current.