Physics
Grade-9
Easy
Question
Magnitude of current across each resistor in a series combination
- Is different in all parts
- Changes as per the value of resistance
- Is the same across each resistance
- None of the above
Hint:
In a series combination of resistors, the current flowing through each resistor is the same as the current flows in one direction.
The correct answer is: Is the same across each resistance
The magnitude of current across each resistor in a series combination is the same across each resistance.
- The current flow in each resistor of a series is equally distributed.
- When a voltage of current is applied to a circuit of a series of resistors, each resistor bears the same voltage and same resistance to them.
- So the magnitude of current across each resistor in a series combination remains the same across each resistor.
Related Questions to study
Physics
In a series circuit, the total resistance is greater than the largest resistance in the circuit.
- Yes
- No
- Maybe
- Cannot say
In a series circuit, the total resistance is greater than the largest resistance in the circuit.
PhysicsGrade-9
- Yes
- No
- Maybe
- Cannot say
Physics
Pick out the correct statement from the following about the parallel combination of resistors.
- The current across the resistors are the same
- The resistance offered by all resistors are the same
- The potential difference is the same across each resistor
- The equivalent overall resistance is larger than the largest resistor
Pick out the correct statement from the following about the parallel combination of resistors.
PhysicsGrade-9
- The current across the resistors are the same
- The resistance offered by all resistors are the same
- The potential difference is the same across each resistor
- The equivalent overall resistance is larger than the largest resistor
Physics
The equivalent overall resistance is smaller than the smallest parallel resistor in a parallel connection. This statement is ____.
- True
- False
- Maybe
- Cannot say
The equivalent overall resistance is smaller than the smallest parallel resistor in a parallel connection. This statement is ____.
PhysicsGrade-9
- True
- False
- Maybe
- Cannot say
Physics
What is the equivalent resistance of a series combination of three resistors?
- Rs= R1 + R2 + R3
- Rs
- Rs
- Rs
What is the equivalent resistance of a series combination of three resistors?
PhysicsGrade-9
- Rs= R1 + R2 + R3
- Rs
- Rs
- Rs
Physics
An electrician installs patio lights in a back yard. Which of the following will increase the efficiency of the wiring system to the back yard?
1- Bury the extension cord deep underground.
2- Use a shorter extension cord.
3- Use a longer extension cord.
4- Use compact fluorescent patio lights
- 1 and 2
- 1 and 3
- 2 and 4
- 3 and 4
An electrician installs patio lights in a back yard. Which of the following will increase the efficiency of the wiring system to the back yard?
1- Bury the extension cord deep underground.
2- Use a shorter extension cord.
3- Use a longer extension cord.
4- Use compact fluorescent patio lights
PhysicsGrade-9
- 1 and 2
- 1 and 3
- 2 and 4
- 3 and 4
Physics
30 Joules of energy enter a light bulb. 20 joules of energy are transformed into light, how much energy is dissipated as heat?
- 6.7 joules
- 10 joules
- 13 joules
- 100 joules
30 Joules of energy enter a light bulb. 20 joules of energy are transformed into light, how much energy is dissipated as heat?
PhysicsGrade-9
- 6.7 joules
- 10 joules
- 13 joules
- 100 joules
Physics
The total resistance in a circuit is equal to the sum of the inverse of each individual resistance.
- Series connection
- Parallel connection
- Both a and b
- None of the above
The total resistance in a circuit is equal to the sum of the inverse of each individual resistance.
PhysicsGrade-9
- Series connection
- Parallel connection
- Both a and b
- None of the above
Physics
Total resistance is the algebraic sum of the resistance across each resistor in
- Series connection
- Parallel connection
- Both a and b
- None of the above
Total resistance is the algebraic sum of the resistance across each resistor in
PhysicsGrade-9
- Series connection
- Parallel connection
- Both a and b
- None of the above
Physics
Total voltage is the sum of the voltage across each resistor in
- Series connection
- Parallel connection
- Both a and b
- None of the above
Total voltage is the sum of the voltage across each resistor in
PhysicsGrade-9
- Series connection
- Parallel connection
- Both a and b
- None of the above
Physics
An oven consumes 425 kWh of energy in order to provide 386 kWh of useful energy. What is its percent efficiency?
- 90%
- 91%
- 92%
- 93%
An oven consumes 425 kWh of energy in order to provide 386 kWh of useful energy. What is its percent efficiency?
PhysicsGrade-9
- 90%
- 91%
- 92%
- 93%
Physics
Your heating system is 55 percent energy-efficient. What amount of energy would it consume to transform 9000 kWh into useful thermal energy for heating the house during the winter?
- 16363.63 kWh
- 163.63 kWh
- 1.6363 kWh
- 1636 kWh
Your heating system is 55 percent energy-efficient. What amount of energy would it consume to transform 9000 kWh into useful thermal energy for heating the house during the winter?
PhysicsGrade-9
- 16363.63 kWh
- 163.63 kWh
- 1.6363 kWh
- 1636 kWh
Physics
A television that is 83% efficient provides 6000 J of useful energy. How much energy does it consume?
- 7229kJ
- 7229 J
- 7500 J
- 7400 J
A television that is 83% efficient provides 6000 J of useful energy. How much energy does it consume?
PhysicsGrade-9
- 7229kJ
- 7229 J
- 7500 J
- 7400 J
Physics
Some homes are still heated by hot water boiler furnaces. The components of the system are an oil tank, a furnace, water pipes and radiators. The furnace burns the oil from the storage tank. The heat released is used to heat water which is then pumped to radiators throughout the house. A diagram is shown below.
If all the heat from the combustion was used to heat the water, the system would be 100% efficient. However, some heat is lost in the furnace exhaust and some is lost from the pipes delivering the water to the radiators.
One litre of oil delivers 48 000 kJ of energy. 7 600 kJ are lost to the exhaust, and 900 kJ are lost in transporting the hot water to the radiators. Determine the efficiency of this heating system.
- 82.2%
- 80%
- 85%
- 90%
Some homes are still heated by hot water boiler furnaces. The components of the system are an oil tank, a furnace, water pipes and radiators. The furnace burns the oil from the storage tank. The heat released is used to heat water which is then pumped to radiators throughout the house. A diagram is shown below.
If all the heat from the combustion was used to heat the water, the system would be 100% efficient. However, some heat is lost in the furnace exhaust and some is lost from the pipes delivering the water to the radiators.
One litre of oil delivers 48 000 kJ of energy. 7 600 kJ are lost to the exhaust, and 900 kJ are lost in transporting the hot water to the radiators. Determine the efficiency of this heating system.
PhysicsGrade-9
- 82.2%
- 80%
- 85%
- 90%
Physics
A simple diagram of a Hydro-Electric System is shown below
why all the energy from the water flowing into the turbine is not transformed into electrical energy.
- Some energy is lost in the process
- All energy is lost in the process
- Water dam stores some energy in it
- It is difficult to transfer potential into electrical energy
A simple diagram of a Hydro-Electric System is shown below
why all the energy from the water flowing into the turbine is not transformed into electrical energy.
PhysicsGrade-9
- Some energy is lost in the process
- All energy is lost in the process
- Water dam stores some energy in it
- It is difficult to transfer potential into electrical energy
