Question

What is a circuit diagram? Draw the labelled diagram of an electric circuit consisting of a cell, a resistor, an ammeter, a voltmeter and a closed switch (or closed plug key). Which of the two has a large resistance : an ammeter or a voltmeter ?

Answer 1

Hint A circuit diagram is a diagrammatic representation of how various electrical components are connected with each other in an electrical system to perform a required task. Draw the symbols of the above mentioned components and explain their placements in the circuit.

Complete step by step answer
In advanced terms, a circuit diagram is mentioned as the graphical representation of an electrical or electronic system or circuit. It is a 2 dimensional plane where the components are placed according to their functions and are connected using wires. The circuit should mainly consist of a source cell of any voltage and should be closed so as to obtain value in measuring devices.
 There are two measuring devices that are most commonly used to regulate values in a circuit. An ammeter is a type of measuring instrument deployed in most of the electrical circuit, that is used to measure the current flowing through the system. An ammeter is connected in series to the measuring quantity because, ammeter is said to have a very low resistance value as it is designed to measure higher values of current. Now, if it is connected in parallel, the ammeter will have a greater resistance resulting in drawing higher current and thus causing damage to the system.
 A voltmeter is a type of measuring device that measures potential difference between two points in an electric circuit. It is highly resistive because parallel connected objects experience the same magnitude of potential difference. If a voltmeter is connected in series, then there would be no current flowing through the circuit.
 

Note Ohm’s law, one of the fundamental laws of electrical studies, was obtained based on the study of voltmeter and ammeter reading of a normal resistor. It stated that the potential difference across the ends of the resistor is directly proportional to the current flowing through the circuit.