Electrical Resistence

Question 1

What is the equation for Voltage

Answer 1

Voltage = Current x Resistance

Question 2

How does the resistance change for a resistor or wire

Answer 2

The resistance remain constant.

Question 3

How does the resistance change for a filament lamp

Answer 3

Here the resistance of the lamp gradually increases and finally slopes because as the temperature of the filament increases, the resistance of the filament also increases, which reduces the current.

Question 4

How does the resistance change for a diode

Answer 4

As long as the current is flowing at the correct direction, the resistance is low, but if the current starts to flow in the opposite direction, the resistance greatly increases.

Question 5

What is the difference between fixed and variable resistors

Answer 5

In fixed resistors, the resistance remains constant all the time.

In variable resistors, the user is able to change the resistance of the circuit.

Question 6

What is the effect of changing the resistance on the current in a circuit.

Answer 6

As the resistance increases, the current flowing through the circuit decreases and vice versa.

Question 7

How does the thermistor change resistance based on temperature

Answer 7

The resistance of thermistor decreases as the temperature increases.

Question 8

How does the resistance change in a LDR

Answer 8

When it is dark, the resistance is high and when light is shown on it, the resistance decreases.

Question 9

How does the resistance change in a Diode

Answer 9

If the current is flowing in the correct direction, the resistance is very low.

If the current is flowing in the opposite direction, the resistance is very high.