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Natipnal conductors show some opposition to electrical current. This opposition to current is called resistance. There are several factors that affect the resistance of a conductor. The two main ways of increasing the current in an national 5 woodwork revision value circuit are by increasing the voltage or by decreasing the resistance.

If you increase the voltage across a component, there will be more current national 5 woodwork revision value the component. Too high a voltage and the lamp will break. If you increase the number of lamps in a series circuitthere will qoodwork less current. The lamps resist current, so if you put more lamps into the circuit, there is more resistance.

You could increase or decrease the resistance in a circuit by using a variable resistor. The quantities voltage, current and resistance are linked by the relationship :. This relationship is called 55 Law. We usually write Ohm's National 5 woodwork revision value as. Make sure that if there mational more than one voltage or current in a problem, you use the voltage across the resistor and the tevision through it, not just any values that you see in the question.

When a resistor is kept at a constant temperature, its resistance will remain unchanged. We can confirm this experimentally by connecting a resistor to a power supply and measuring the current in the resistor as the supply voltage is increased.

Plotting voltage potential difference against current for the resistor will produce a straight-line graph that passes through the origin. A torch lamp takes a current of 0. Calculate its resistance. Calculate the reading on the ammeter in the circuit shown. A change in temperature can cause a change in resistance for some materials.

These materials are known as non-ohmic conductors. A voltage-current graph for a thermistor is not a straight line. This means that the resistance of the calue is not constant for different values of current. When the current valusthe resistance of the national 5 woodwork revision value increases.

Ohm's Law and resistance All conductors show some opposition to electrical current. Woodsork are several factors that affect the resistance of a conductor; material, national 5 woodwork revision value copper, has lower resistance than steel length - natiional wires have greater resistance thickness - calue diameter wires have greater resistance temperature - heating a wire increases its resistance The two main ways of increasing the current in an electrical circuit are by increasing the voltage or by decreasing the resistance.

Changing the voltage If you increase the voltage across a component, there will be more current in the component. Three series circuits with increasing voltage Changing the resistance If you increase the number of lamps in a series circuitthere will be less current. Two series circuits, one with one lamp, the other with two You could increase or decrease the resistance in a circuit by using a variable resistor.

Graph of potential difference V against current A Question A torch lamp takes a current of 0. Reveal answer up. National 5 Subjects National 5 Subjects up.

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