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Electric Circuits
A capacitor of value 10 micro Farads is connected in series with a resistor of value 10 ohms. Calculate the value of the time constant
Electric Circuits
An electronic engineer needs a particular value of capacitance for his new design for the car courtesy light to dim at a particular rate when the car is locked remotely using a wireless key.
He needs a capacitance of exactly 12 micro Farads. Which of the four possibilities will give him that value?
1. Two capacitors in series, each of value 6 microFarads
2. Two capacitors in parallel, each of value 6 microFarads
3. Two capacitors in series, one of value 4 microFarads and the other of value 2 microFarads.
4. Two capacitors in parallel, each of value 24 microFarads
He needs a capacitance of exactly 12 micro Farads. Which of the four possibilities will give him that value?
1. Two capacitors in series, each of value 6 microFarads
2. Two capacitors in parallel, each of value 6 microFarads
3. Two capacitors in series, one of value 4 microFarads and the other of value 2 microFarads.
4. Two capacitors in parallel, each of value 24 microFarads
Electric Circuits
You are required to specify the power rating of a resistor, R1, to be used in a car engine management system, so that an order can be placed for the component (resistor).
the resistance required is 2Ω. The maximum current that will be flowing in the resistor will be 10A.
You only have four ratings to choose from. Select the most appropriate power rating for this resistor.
the resistance required is 2Ω. The maximum current that will be flowing in the resistor will be 10A.
You only have four ratings to choose from. Select the most appropriate power rating for this resistor.
Electric Circuits
You are required to specify the power rating of a resistor, R1, to be used in a car engine management system, so that an order can be placed for the component (resistor).
the resistance required is 2Ω. The maximum current that will be flowing in the resistor will be 10A.
You only have four ratings to choose from. Select the most appropriate power rating for this resistor.
the resistance required is 2Ω. The maximum current that will be flowing in the resistor will be 10A.
You only have four ratings to choose from. Select the most appropriate power rating for this resistor.
Electric Circuits
The ratio of pressure force L to friction force D for an object A in contact with object B is L/D = 10. what is the coefficient of friction of A/B?
Electric Circuits
In investigating an existing design of a circuit, it was found that a 25Ω resistor dissipates 9W.
The engineer decides to put a 12.5Ω resistor in series with this 25Ω resistor.
What is the power dissipation now in the 25Ω resistor with the same supply voltage after the 12.5Ω resistor was added?
(clue - determine what the supply voltage is from the given information. Then you can either use the voltage divider theory to find the voltage now dropped across the 25Ω and then work out the power, or you can calculate the total current now drawn by both resistors and then work out the power across the 25Ω resistor!
The engineer decides to put a 12.5Ω resistor in series with this 25Ω resistor.
What is the power dissipation now in the 25Ω resistor with the same supply voltage after the 12.5Ω resistor was added?
(clue - determine what the supply voltage is from the given information. Then you can either use the voltage divider theory to find the voltage now dropped across the 25Ω and then work out the power, or you can calculate the total current now drawn by both resistors and then work out the power across the 25Ω resistor!
Electric Circuits
A current of 0.5A flowing through a wire produces 21J of heat in 1/2 min. The resistance of the wire is ----------- ohms to 1 place of decimal
Electric Circuits
Explain how safety devices protect the appliances in the circuit.
Electric Circuits
A voltmeter coil has resistance 50 ohm and a resistor of 1.15 kilo ohm is connected in series. it can read potential differences up to 12 volts. if the same coil is used to construct an ammeter which can measure currents up to 2 ampere, what should be the resistance of the shunt used?
Electric Circuits
A tightly coiled spring having 75 coils, each 3.50 cm in diameter is made of insulated metal wire which is 3.25 mm in diameter. An ohm meter connected across its opposite ends reads 1.74 ohm. what is the resistivity of the metal?
