 Resistance Homework : Foundation level

1.      In the space draw a circuit containing a battery, a voltmeter, an ammeter and a resistor. Show how the components should be arranged so that the resistance of the resistor can be measured.

2.      Write down the resistance equation

3.      If the voltage across a lamp is 8V and the current through the resistor is 2.4A, calculate the resistance of the lamp.

4.      Cross out the wrong answers in the brackets.

a)      The resistance of a metal wire (increases/decreases/stays the same) as the voltage increases.

b)      The resistance of a lamp (increases/decreases/stays the same) as the voltage increases.

5.      On the graph axes shown below say which component would produce each line on the graph. a)      Line A is a (lamp/resistor/diode)

b)      Line B is a (lamp/resistor/diode)

c)      Line C is a (lamp/resistor/diode)

6.      Two resistors have resistances of 56W and 47W.

a)      If they were connected in series the total resistance would be

A: 1.2W           B : 51.5W         C : 103W

b)      If they were connected in parallel the total resistance would be

A : 25.5W        B : 51.5W         C : 103W