AS - electricity

This is a graph for a ..............................

• LDR

• Thermistor

• Diode

• Resistor

• Filament lamp

This is a graph for a ...............................................

• LDR

• Thermistor

• Diode

• Resistor

• Filament lamp

As the temperature increases, the resistance

• increases

• decreases

• stays the same

• can not say

What is the correct symbol for a LDR (light dependent resistor)?

• 
• 
• 
• 
• 

What is the correct symbol for a thermistor?

• 
• 
• 
• 
• 

In the equation I=nAve, which optionS correctly describe the meaning of n?

• the charge carrier density

• the number of charge carriers per unit volume

• the number of charge carriers per m³

• the number of charge carriers in the wires

• the total charge carriers available in the battery

If the current in a specific copper wire increases this can be due to _____________________.

• An increase in the charge carrier density

• An increase in the electron drift speed

• An decrease in its cross sectional area

• An increase in the charge of electrons

The graph shows the change in current with potential difference for

• an LED

• a filament lamp

• a diode

• a thermistor

To calculate the resistance of the component at a particular potential difference you

• read the current at that point on the graph and calculate p.d divided by current

• draw a tangent to the line at that point and calculate the gradient

• draw a tangent to the line at that point and calculate 1/gradient

• read the current at that point on the graph and calculate current/p.d

The resistance of the component

• is always constant as the p.d. increases

• starts high and then decreases as the p.d. increases

• starts constant for low values of p.d. and then increases as the p.d. increases

• starts constant for low values of p.d. and then decreases as the p.d. increases