$(a)$ Name an instrument that measures electric current in a circuit. Define the unit of electric current.
$(b)$ What do the following symbols mean in an electric circuit?
$(c)$ Draw a closed circuit diagram consisting of a $0.5\, m$ long nichrome wire $XY$,an ammeter,a voltmeter,four cells of $1.5\, V$ each,and a plug key.
$(b)$ What do the following symbols mean in an electric circuit?
$(c)$ Draw a closed circuit diagram consisting of a $0.5\, m$ long nichrome wire $XY$,an ammeter,a voltmeter,four cells of $1.5\, V$ each,and a plug key.
(N/A) The instrument used to measure electric current in a circuit is an ammeter.
The unit of electric current is the ampere $(A)$. One ampere is defined as the flow of $1$ coulomb of electric charge through a cross-section of a conductor in $1$ second.
$(b)$ $(i)$ The symbol represents a rheostat or variable resistance.
$(ii)$ The symbol represents a closed plug key or a closed switch.
$(c)$ The circuit diagram consists of a battery of four cells (total $6\, V$),a plug key (closed),an ammeter connected in series with the $0.5\, m$ nichrome wire $XY$,and a voltmeter connected in parallel across the wire $XY$.
The unit of electric current is the ampere $(A)$. One ampere is defined as the flow of $1$ coulomb of electric charge through a cross-section of a conductor in $1$ second.
$(b)$ $(i)$ The symbol represents a rheostat or variable resistance.
$(ii)$ The symbol represents a closed plug key or a closed switch.
$(c)$ The circuit diagram consists of a battery of four cells (total $6\, V$),a plug key (closed),an ammeter connected in series with the $0.5\, m$ nichrome wire $XY$,and a voltmeter connected in parallel across the wire $XY$.
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Similar Questions
$(a)$ What is meant by saying that the potential difference between two points is $1$ volt?
$(b)$ Why does the connecting cord of an electrical heater not glow while the heating element does?
$(c)$ Electrical resistivities of some substances at $20^{\circ}C$ are given below:
Silver $1.60 \times 10^{-8} \, \Omega m$ Copper $1.62 \times 10^{-8} \, \Omega m$ Tungsten $5.2 \times 10^{-8} \, \Omega m$ Iron $10.0 \times 10^{-8} \, \Omega m$ Mercury $94.0 \times 10^{-8} \, \Omega m$ Nichrome $100 \times 10^{-6} \, \Omega m$
Answer the following questions in relation to them:
$(i)$ Among silver and copper, which one is a better conductor? Why?
$(ii)$ Which material would you advise to use in electrical heating devices? Why?
$(b)$ Why does the connecting cord of an electrical heater not glow while the heating element does?
$(c)$ Electrical resistivities of some substances at $20^{\circ}C$ are given below:
| Silver | $1.60 \times 10^{-8} \, \Omega m$ |
| Copper | $1.62 \times 10^{-8} \, \Omega m$ |
| Tungsten | $5.2 \times 10^{-8} \, \Omega m$ |
| Iron | $10.0 \times 10^{-8} \, \Omega m$ |
| Mercury | $94.0 \times 10^{-8} \, \Omega m$ |
| Nichrome | $100 \times 10^{-6} \, \Omega m$ |
Answer the following questions in relation to them:
$(i)$ Among silver and copper, which one is a better conductor? Why?
$(ii)$ Which material would you advise to use in electrical heating devices? Why?
Medium
View SolutionHow is an ammeter connected in a circuit?
Easy
View Solution$A$ cylindrical conductor of length $l$ and uniform area of cross-section $A$ has resistance $R$. Another conductor of length $2l$ and resistance $R$ of the same material has area of cross-section:
Medium
View Solution$A$ cylinder of a material is $10\, cm$ long and has a cross-section of $2\, cm^{2}$. If its resistance along the length is $20\, \Omega$,what will be its resistivity in number and units?
Easy
View SolutionDraw a circuit diagram for a circuit consisting of a battery of five cells of $2 \text{ V}$ each, a $5 \, \Omega$ resistor, a $10 \, \Omega$ resistor, and a $15 \, \Omega$ resistor, an ammeter, and a plug key; all connected in series. Also, connect a voltmeter to record the potential difference across the $15 \, \Omega$ resistor and calculate:
$(i)$ the electric current passing through the above circuit and
$(ii)$ the potential difference across the $5 \, \Omega$ resistor when the key is closed.
$(i)$ the electric current passing through the above circuit and
$(ii)$ the potential difference across the $5 \, \Omega$ resistor when the key is closed.
Medium
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