If resistance is doubled, the current shall become half. R = (110 × 10)/17 R = / What will be the current in the circuit? Example 2: If the potential difference between the terminals of an electric motor is 220 V and an electric current of 5 A is flowing through it what will be the resistance of electric motor? Repeat above steps by increasing the number of cells in the circuit. Elements of electric iron, heater, electric kettle, geyser, etc. If the potential difference between two terminals of electric fan is 240 V, what will be resistance? Resistance is 0.05 Ω R = 0.05 Ω / = I What current will the heater draw if the potential difference is increased to 120 V? NCERT Question 7 - R = 220/3.4 Let us try to understand the factors which affect the resistance of a conductor.
Questions NCERT Question 7 - The values of current I flowing in a given resistor for the corresponding values of potential difference V across the resistor are given below – I (amperes) 0.5 1.0 2.0 3.0 4.0 V (volts) 1.6 3.4 6.7 10.2 13.2 Plot a graph between V and I and calculate the resistance of that resistor. Potential Difference = V = 220 V Given that the resistance (R) of a device – in this case the light bulb – is constant, if we were to change the current or voltage being provided to the device, we would have an effect on the power. This means that for a given conductor and at a given temperature, the ratio of V to I is constant. Resistance is Inversely Proportional to Current, It means that if we increase Resistance,Electric Current Decreases, If we decrease Resistance,Electric Current Increases, Suppose we increase Resistance from 20Ω to 25Ω, Hence if Resistance increases ,Electric Current Decreases, Similarly,if we decrease Resistance from 20Ω to 10Ω, Hence if Resistance Decreases, Electric Current Increases, This shows that Resistance is inversely Proportional to Electric Current. By Ohm’s law, He provides courses for Maths and Science at Teachoo. Current is 4 A
George Simon Ohm (1787 – 1854) was a German physicist.
We need to find current (I) I = 110/(1100/17) Let us do the following actions to understand this. This value is called resistance. Resistance and resistivity of a material vary with temperature.
∴ / = R R = (220 × 10)/34 Important Note: Nichrome is an alloy of nickel, chromium, manganese and iron. It is measured in Ohms. PREVIOUS NEXT. R = 1100/17 Ω Silver has the least resistivity. The resistivity of insulators is very high and that is why they are bad conductors of electricity. I (amperes) 0.5 1.0 2.0 3.0 4.0 Alloys do not get oxidised (burnt) at high temperature. I = 4 A This means electric current will decrease with increase in resistance and vice versa. Ohm’s Law states that the potential difference between two points is directly proportional to the electric current. Question 3 An electric iron draws a current of 3.4 A from the 220 V supply line. I = (110 × 17)/1100
Voltage, i.e. The SI unit of resistance is Ohm (Ω). I = 24/6
The values of current I flowing in a given resistor for the corresponding values of potential difference V across the resistor are given below – We know Resistance and Potential Difference,
Potential difference (V) =. By Ohm’s law This means that current through a conductor is inversely proportional to the resistance of the conductor. 1 ohm (Ω) of Resistance (R) is equal to the flow of 1 A of current through a conductor between two points having potential difference equal to 1 V. This means `1Ω=(1V)/(1A)` From the expression of Ohm’s Law it is obvious that electric current through a resistor is inversely proportional to resistance. Attach a third nichrome wire with the same length as the first wire but double thickness (marked as 3) in the circuit.
Attach another nichrome wire of same thickness but double length, i.e. Login to view more pages. Resistance = R = 6 Ω Learn Science with Notes and NCERT Solutions, Factors on which Resistance of Conductor Depends, Resistance in Series and Parallel - Full Comparison, Applications of Heating Effect of Electric Current, If electric Current Increases, Potential Difference increases, If electric Current Decreases, Potential Difference decreases.
I = / I (amperes) 0.5 1.0 2.0 3.0 4.0 Plot a graph between V and I and calculate the resistance of that resistor. Resistance = 1100/17 Ω V = I R Factors on which resistance of a conductor depends. This means that silver is the best conductor of electricity.
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