Electricity

Question 1

resistance in a wire

Answer 1

as length of wire increases, resistance also increases

Question 2

series and parallel circuits with resistors

Answer 2

adding resistors in series increases total resistance of the circuit, in a parallel circuit the more resistors you add the smaller the resistance

Question 3

Static

Answer 3

a build up caused by friction. when materials rub off one another, electrons move from material to the other. one material becomes positively charged and one becomes negatively charged

Question 4

why can static cause a spark

Answer 4

when the potential difference is large enough, the electrons can jump across the gap causing a spark.

Question 5

Force in an electric field

Answer 5

electric charges create an electric field, the closer you get to an object the stronger the field. if a charged object is placed near the field, it will experience a force, which increases with closer distance

Question 6

ohmic conductor

Answer 6

current is directly proportional to potential difference-straight line

Question 7

filament lamp

Answer 7

as current increases, so does the temp, making it harder for the current to flow-graph becomes less steep

Question 8

diode

Answer 8

current only flows in one direction, the resistance is very high in the other direction so no current can flow.

Question 9

LDR

Answer 9

light dependent resistor (in bright light resistance falls, in dim light resistance increases)

Question 10

thermistor

Answer 10

temperature dependent resistor (in heat resistance decreases)