Potential Dividers Quick Check

R1 has much higher resistance than R2. The p.d across R1 will be...?

• lower than the p.d across R2

• the same as the p.d across R2

• greater than the p.d across R2

• Not enough information to say

R1 = 5 ohms, R2 = 10 ohms. Which option shows possible values of V1 and V2?

• V1 = 4V, V2 = 2V

• V1 = 4V, V2 = 4V

• V1 = 2V, V2 = 4V

• V1 = 6V, V2 = 10V

Light levels decrease. What happens to V2?

• V2 decreases

• V2 stays the same

• V2 increases

Light levels increase. What happens to V1?

• V1 increases

• V1 stays the same

• V1 decreases

The temperature goes down. What happens to V?

• V decreases

• V stays the same

• V increases

The temperature increases. What happens to V?

• V increases

• V stays the same

• V decreases

R1 = 50ohms, R2 = 250ohms, V = 12V, what is V1?

• 1V

• 2V

• 3V

• 4V

At a particular temperature, the p.d across the fixed resistor is 3V. The fixed resistor is 4.7kohms. What is the resistance of the thermistor at this temperature?

• 14.1kohm

• 9.4kohm

• 2350ohms

V = 15V, V2 = 9.5V, RLDR = 2500ohms. What is the value of R1?

• 4320ohms

• 660ohms

• 1450ohms