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4. A length of Nichrome wire with cross sectional area $2.60 \times 10^{-6} m^2$ has a potential difference of 110 V across it. Nichrome has a resistivity of $5.00 \times 10^{-7} \Omega m$. The element dissipates thermal energy at a rate of 5000 W. Calculate (i) The current flowing through the wire. (ii) The length of the wire. (iii) Given that each cubic metre of nichrome contains $9.0 \times 10^{28}$ conduction electrons, calculate the drift velocity of the electrons. 5. An experimenter winds a coil from a 3.0 m length of 1.0 mm diameter copper wire. a) What is the resistance of the coil at room temperature? b) What length of 0.50 mm diameter constantan wire would have the same resistance? Material Copper Constantan Resistivity ($\Omega m$) $1.7 \times 10^{-8}$ $4.9 \times 10^{-7}$ 6. At room temperature a metal has a resistivity of $4.5 \times 10^{-7} \Omega m$. A wire made from this metal has a radius of 0.70 mm. a) Calculate the resistance of a 2.5 m length of the wire at room temperature. b) Calculate the power dissipated in this length of wire when it carries a current of 20 mA. Assume the resistance of the wire is constant.

          4. A length of Nichrome wire with cross sectional area $2.60 \times 10^{-6} m^2$ has a potential
difference of 110 V across it. Nichrome has a resistivity of $5.00 \times 10^{-7} \Omega m$. The element
dissipates thermal energy at a rate of 5000 W.
Calculate
(i) The current flowing through the wire.
(ii) The length of the wire.
(iii) Given that each cubic metre of nichrome contains $9.0 \times 10^{28}$
conduction electrons, calculate the drift velocity of the electrons.
5. An experimenter winds a coil from a 3.0 m length of 1.0 mm diameter copper wire.
a) What is the resistance of the coil at room temperature?
b) What length of 0.50 mm diameter constantan wire would have the same resistance?
Material
Copper
Constantan
Resistivity ($\Omega m$)
$1.7 \times 10^{-8}$
$4.9 \times 10^{-7}$
6. At room temperature a metal has a resistivity of $4.5 \times 10^{-7} \Omega m$. A wire made from this
metal has a radius of 0.70 mm.
a) Calculate the resistance of a 2.5 m length of the wire at room temperature.
b) Calculate the power dissipated in this length of wire when it carries a current of
20 mA. Assume the resistance of the wire is constant.

4. A length of Nichrome wire with cross sectional area 2.60 × 10^-6 m^2 has a potential
difference of 110 V across it. Nichrome has a resistivity of 5.00 × 10^-7Ω m. The element
dissipates thermal energy at a rate of 5000 W.
Calculate
(i) The current flowing through the wire.
(ii) The length of the wire.
(iii) Given that each cubic metre of nichrome contains 9.0 × 10^28
conduction electrons, calculate the drift velocity of the electrons.
5. An experimenter winds a coil from a 3.0 m length of 1.0 mm diameter copper wire.
a) What is the resistance of the coil at room temperature?
b) What length of 0.50 mm diameter constantan wire would have the same resistance?
Material
Copper
Constantan
Resistivity (Ω m)
1.7 × 10^-8
4.9 × 10^-7
6. At room temperature a metal has a resistivity of 4.5 × 10^-7Ω m. A wire made from this
metal has a radius of 0.70 mm.
a) Calculate the resistance of a 2.5 m length of the wire at room temperature.
b) Calculate the power dissipated in this length of wire when it carries a current of
20 mA. Assume the resistance of the wire is constant.

Added by Jordi H.

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