What will happen if the resistance is doubled?
The current is reduced to half its previous value. Answer. Step by step solution by experts to help you in doubt clearance & scoring excellent marks in exams.
What affects the resistance of a thermistor?
With an NTC thermistor, when the temperature increases, resistance decreases. Conversely, when temperature decreases, resistance increases. When temperature increases, the resistance increases, and when temperature decreases, resistance decreases. This type of thermistor is generally used as a fuse.
How does the resistance of a thermistor increase?
A thermistor may be described as: ntc negative temperature coefficient : its resistance decreases as the temperature increases. ptc positive temperature coefficient : its resistance increases as the temperature increases.
Does the resistance of a lamp increases as the current flowing through it increases?
The resistance of a lamp increases as the temperature of its filament increases. The current flowing through a filament lamp is not directly proportional to the voltage across it.
Why does resistance decrease as light intensity increases?
This is a type of resistor which has a resistance that changes with the amount of LIGHT that falls on it. The light energy produces more free electrons which increases the current for a certain voltage across the LDR which means a drop in resistance.
What happens to voltage when light intensity increases?
1 Answer. Daniel W. An increase in light intensity decreases the LDR’s resistance and therefore the potential difference across the LDR will decrease (if it is in a potential divider).
What happens to the resistance of an LDR when light increases?
When the light level decreases, the resistance of the LDR increases. As this resistance increases in relation to the other Resistor, which has a fixed resistance, it causes the voltage dropped across the LDR to also increase.
What happens to current and resistance when a battery is upgraded?
This equation, i = v/r, tells us that the current, i, flowing through a circuit is directly proportional to the voltage, v, and inversely proportional to the resistance, r. In other words, if we increase the voltage, then the current will increase. But, if we increase the resistance, then the current will decrease.
What happens to the power of the circuit when the resistance is decreased?
Throughout the lab it has proven that if you decrease resistance, the power will increase as well as the current.
Is there any change in current as it passes through a resistor?
And for a particular resistance, current depends on applied voltage. So, when current passes through a resistor, no change in current seen unless we change the resistance. Answer: No change in current.
What does a resistor do to current?
A resistor has the ability to reduce voltage and current when used in a circuit. The main function of a resistor is to limit current flow. Ohm’s law tells us that an increase in a resistors value will see a decrease in current. To reduce voltage, resistors are set up in a configuration known as ‘voltage divider’.
Do electrons slow down in a resistor?
Yes, speed of electrons are slow down by resistor. Because numbner of electrons remain same in the closed circuit or wire, due to conservation of charge in any case. But due to addition of a external resistor current will decreases, by aplying ohm’s law( V=IR).
Does current stay constant in a parallel circuit?
Each resistor in parallel has the same voltage of the source applied to it (voltage is constant in a parallel circuit). Parallel resistors do not each get the total current; they divide it (current is dependent on the value of each resistor and the number of total resistors in a circuit).