a) A1500W heater is connected to a 120V line. How many heat energy does it produce in 2.0hours? b) The resistivity of gold is 2.44x10-8ohm.m at room temperature. A gold wire that is 1.8mm in diameter and 11cm long carries a current of 170mA. How much power is dissipated in the wire?

Q: a. A proton beam in an accelerator carries a current of 110 µA. If the beam is incident on a target,…

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Q: A resistor with a 15.0 V potential difference across its ends emits thermal energy at a rate of 327…

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A: Given Initial resistance R0 = 220 ohm Final resistance R = 214 ohm Initial temperature To = 32oF…

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A: Electricity.

Q: Resistance of potentiometer wire is 12 per meter. A Daniel cell of e.m.f. 1.08 v balances at 216 cm…

A: To find-(1) Current through wire=?(2) Balancing length (l2)=?Given-Resistance per meter=1 ohmE1=1.08…

Q: 2. An air conditioner draws 14.0 A at 220-V. The connecting cord is copper wire (resistivity of…

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Q: What is the resistance (in units of Q) of a wire made of a material with a resistivity of 3.2 x 10-8…

A: It is given that ρ=3.2×10-8 Ω.ml=46.5 md=0.5 mm=0.5×10-3 m

Q: 1. What length of copper (p=1.78 x 10-80m) wire 1.2 mm in diameter is needed to make a 20-Q resistor…

A: Given that,Resistivity of copper : ρ = 1.78×10-8  (Ohm.m)Diameter : D = 1.2 (mm)Radius : r = D2 =…

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A: Recall P=i2R Where i is current and R is resistance of the resistor.

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Q: What current flows through the bulb of a 3.00 V flashlight when its hot resistance is 3.60 Q? The…

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Q: Calculate the resistivity of a material of a wire 10 m long. 0.2 mm in diameter and having a…

A: Given that:-Length, l=10 Radius, r= 0.2=0.2×10-3 mResistance, R=2ΩWe know that resistivity,…

Q: wire has a diamter of D=0.65 cm and is L=6.5 m long. When connected to a V=14 V source the wire…

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Q: An electric flat iron draws a current of 15 A when connected to a 110 V line. a. Assuming that the…

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Q: 1. What current flows through a 0.50 mm diameter rod of Aluminum that is 20.0 cm long, when 22 V is…

A: Resistance=ρLA A= π r2 = 1.96x10-7 m2 Resistance = 0.027 ohm

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Q: A) A long wire with a radius of 0.450 cm carries a current. The potential difference across a 3.60 m…

A: Current in the circuit = Potential difference/ Resistance of wire. Using relation between resistance…

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Q: A potential difference of 3.12 nV is set up across a 2.31 cm length of copper wire that has a radius…

A: Potential difference or voltage is Length of copper wire is Radius of wire is Time is Resistivity of…

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Q: The following results are for five cells in series. The e.m.f. of the five cells together is 6.9 V.…

A: E = 6.9 V  V = 3.3 V R = 2.2 ohm  I = 1.5 A

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Q: A copper wire is 2.50 m long and has a diameter of 2.5 mm. How much current will it draw when…

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Q: A piece of wire of length 31.5 cm and cross-sectional area 227.4 cm² is made into a resistor of…

A: Given: The length of the wire is 31.5 cm. The area of the wire is 227.4 cm2. The resistance of the…

Q: 1. An unknown alloy is subjected to an electric field of 25 V/m, and has a current density of 1.45 ×…

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Q: A 150 W heating coil (like a light bulb) is designed to operate from 125 V. The coil is made from a…

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Q: A copper transmission cable 100 km long and 10.0 cm in diametercarries a current of 125 A. How much…

A: Given that  length of cable, l=100 Km diameter of cable, d=10.0 cm current, I=125 A Resistivity of…

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Q: A resistor has four color bands: brown, orange, yellow, and Gold. What is its resistance? b.  A 60…

A: Here,  Brown → 1Orange →3Yellow → 105Gold → ±5% Therefore, the resistance is 130,000±5% ohm

Q: 1. a) Find the electrical resistance of a 0.5 cm long, 22-gauge silver wire, if the electrical…

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Q: The heater element of a 120V toaster is a nichrome wire with length of 5.4 m, and diameter of .48…

A: First, to find the resistance of the wire by R=ρlA where ρ is resistivity           l is the length…

Q: 5. A copper wire is 2.50 m long and has a diameter of 2.5 mm. How much current will it draw when…

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Q: If the current density in a cop b. C. 0.138 V/m Not enough information d. 7.25 V/m 4.64 x 10¹4 V/m

A: Given data, Conductivity of copper σ=5.8×107 S/m. Current density J=8×106 A/m2.

Q: Q3. An automobile battery has a potential difference of 12.0 V and sends current through a circuit…

A: Given: The potential difference is 12 V. The resistance is 1.5 ohm. The length of the wire is 1.0 m.…

Q: A long wire with a radius of 0.450 cm carries a current. The potential difference across a 3.10 m…

A: The radius of the long wire is r= 0.450 cm= 0.45x10-2 m. The length of the wire section is L = 3.10…

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Q: Given that the delivered power to a resistor is equal to P when the current flowing in the resistor…

A: in solving this problem i have used the formula for power across a resistor R  P=I2R

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Q: An electric flat iron draws a current of 15 A when connected to a 110 V line.…

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Q: An iron wire has a resistance of 78.7. m ohm at 20 degrees Celsius. When the wire carries a current,…

A: The temperature coefficient of resistance for iron is 0.0057 C-1 ...

Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.