What are the precautions taken when doing the experiment of resistance in series or parallel?

(i) Clean the ends of the connecting wires by sand paper. (ii) The connections should be tight. (iii) Close the key (K) only when readings are to be taken. (iv) Zero errors and the ranges of the ammeter and voltmeter should be noted.

What is Ohm’s law and what experimental values would you need to obtain in order to determine the resistance of a resistor?

Ohm’s law simply states that the ratio of voltage across an electric resistor to the current through that resistor is a constant called the electric resistance of that resistor. If V is in volts and I in amps, R will be in ohms. The preferred version of this formula is V = R I.

What is the aim of Ohm’s law experiment?

The objective of this lab is to determine the resistance of several resistors by applying Ohm’s Law. Students will also be introduced to the resistor color code and refresh their graphing skills. In this experiment, the current flowing through a resis- tor will be measured as the voltage across the resistor is varied.

What are the PRECautionS used when we are doing meter bridge experiment?

(i) Clean the connecting wires and the connecting points of metre bridge properly with sand paper. (ii) All connections should be neat and tight. (iii) Balance point should lie between 30 cm and 70 cm. (iv) Do not keep the jockey and the wire in contact for a long time.

What precaution must be taken when measuring resistance?

OHMMETER Safety PRECautionS Do not apply power to a circuit while measuring resistance. When you are finished using an ohmmeter, switch it to the ofF position if one is provided and remove the leads from the meter.

What is the conclusion of Ohm’s law experiment?

Experiment conclusion: The data shows that the higher the voltage, then the higher current, meaning that the voltage is directly proportional to the current, which is what ohms law states.

Is Ohm’s law for good conductor?

With a constant voltage applied, the greater the resistance of the circuit, the less current will flow. Notice that Ohm´s law states “In metallic conductors” This means that the law holds good for most materials that are metal, but not all.

What can you conclude about Ohm’s law?

Experiment conclusion: The data shows that the higher the voltage, then the higher current, meaning that the voltage is directly proportional to the current, which is what ohms law states. As shown above, the voltage is directly proportional to the current.

What precautions you will take while using the Wheatstone bridge?

Precautions: (i) The null point should lie in the middle of the wire. (ii) The current should not be allowed to flow in the wire for a long time.

What precautions do you take to minimize the error in finding the unknown resistance of the given wire?

(c) To minimise error in finding the unknown resistance of the given wire, the precaution to be taken are:

1. the balance point should lie between 30cm and 70cm.
2. clean the connecting wires and connecting points of the meter bridge properly with sandpaper.

What special precaution is necessary for measuring current with an ammeter?

PRECAUTIONS WHILE USING AN AMMETER Never connect an Ammter across a source of emf. Because of its low resistance it would draw damaging high current and destroy the delicate movement. Always connect an ammeter in series with a load capable of limiting the current. Observe the correct polarity.