Answer to Question #55898 in Electricity and Magnetism for kola

Question

6 Calculate the currents in $3\Omega$ resistor
0.36A
2.54A
1.42A
3.46A

7 Calculate the currents in the circuit
1.94A
1.36A
3.23A
5.45A

8 Electrical energy is sold by PHCN in units of kilowatt-hour (kWh). The lighting of a house is done with five 60W bulbs which are swithed on for approximately three hours per day. What is the lighting bill for the household over a period of 30days at the rate of N1.20 per kilowatt-hour?
N1.50
N25.30
N32.40
N52.20

9 A battery has emf 13.2V and internal resistance $24m\Omega$. If the load current is 20.0A, find the terminal voltage o f the battery
12.7V
14.5V
16.8V
17.7V

10 A cirrent flows in a wire of circular cross-section with the free electrons travelling with a mean drift velocity v. If an equal current flows in a wire of the same material but of twice theradius, what is the new mean drift velocity?
v/4
v/2
2v
4v

Answer 1

8 Electrical energy is sold by PHCN in units of kilowatt-hour (kWh). The lighting of a house is done with five 60W bulbs which are swithed on for approximately three hours per day. What is the lighting bill for the household over a period of 30days at the rate of N1.20 per kilowatt-hour?
The answer is:
N32.40


9 A battery has emf 13.2V and internal resistance $24m\Omega$. If the load current is 20.0A, find the terminal voltage o f the battery
The answer is:
12.7V

10 A cirrent flows in a wire of circular cross-section with the free electrons travelling with a mean drift velocity v. If an equal current flows in a wire of the same material but of twice theradius, what is the new mean drift velocity?
The answer is:
v/4