A certain copper wire has a resistance of 25 ohms at 10°𝐶. Take the temperature coefficient at 10°𝐶 to be 𝛼 = 0.00405 °𝐶⁻¹. What must be the maximum operating temperature of the wire if its resistance is to be increase by at most 20%?

A cylindrical copper rod has resistance R. It is reinforced to twice its original length with NO change of volume. What is the new resistance?

For any circuit the number of independent equations containing unit’s, resistance, and current, equal the number of

Four wires meet at a junction. The first carries 4 A into the junction, the second carries 5 A out of the junction and the third carries 2 A out of the junction. The fourth carries ______ the junction.

In the context of the loops and junctions’ rules for electrical circuits a junction is where ______.

If the potential difference across a resistor is doubled only _____________.

Nine identical wires, each of diameter d and length L, are connected in PARALLEL. The combination has the same resistance as a SINGLE similar wire of depth L but whose diameter is ______.

A certain voltmeter has an internal resistance of 10 kΩ and a range from 0 to 12 V. To extend its range to 120 V, use a series resistance of _________ Ω.

A 15 Ω resistor is connected in parallel with a series combination of resistor of 8 and 12 Ω. If the voltage drop across the 8 Ω resistor is 48 V, what is the total voltage applied?

Which of the following will you connect to make a galvanometer into ammeter?

Resistor 1 has twice the resistance of resistor 2. They are connected in parallel to a battery. Find the ratio of thermal energy generation rate in resistor 1 to that in resistor 2?

The substation bus bar is made up of 2 inches round copper bars 20 ft long. What is the resistance of each bar if resistivity is 1.724 x 10⁻⁶ ohm-cm.

A resistor with resistance R1 and a resistor with resistance R2 are connected in parallel to an ideal battery with emf V. What is the rate of thermal energy generation in the resistor with resistance R1?

Current has units of __________.

A stationary conducting loop with an internal resistance of 0.50 ohm is placed in a time-varying magnetic field. When the loop is closed, a current of 5 A flows through it. What will the current be if the loop is opened to create s small gap and a 2-ohm resistor is connected across its open ends?

The resistance of resistor 1 is twice of resistor 2. The two are connected in SERIES and a potential difference is maintained across the combination. What is the rate of thermal energy generation in resistor 1?

Two copper conductors have equal length. The cross-sectional area of one conductor is three times that of the other. If the resistance of the conductor having smaller cross-sectional area is 20 Ω, what is the resistance of the other?

What is the value of the resistor with color coded Green-Blue-Red-Gold?

Two wires of the same material have the same lengths but different diameters. They are connected in SERIES to a battery. Which of the following quantity is the same for the two wires?

Two 110-V light bulbs, one “25 and the other “100W” are connected in series to a 110 V source. Then, which of the following statement is correct with regard to above sentence?

A 15-ohm resistor is connected in parallel with a series combination of resistors of 8 and 12 ohms. If the voltage drop across the 8-ohm resistor is 48 V, what is the total current in A?

A coil of wire having a resistance of 3.75 ohm and carrying a current of 0.3 A is in parallel with an unknown resistance through which there a current of 1.5 A. Determine the total equivalent resistance.

A circuit consisting of three resistors rated: 10 ohms, 15 ohms and 20 ohms are connected in delta. What would be the resistance of the equivalent wye connected load?

Twelve identical wires each of resistance 6 ohms are arranged to form the edge of a cube. A current of 40 mA is led into the cube at one corner and out at the other diagonally opposite corners. Calculate the potential difference developed between these corners.

Two resistors are connected in parallel across a potential difference. The resistance of resistor A is twice that of resistor B. If the current carried by resistor A is I, then what is the current carried by B?

A 3 Ω and 1.5 Ω resistors are wired in parallel and the combination is wired in SERIES to a 4 Ω resistor and a 10-V emf device. What is the current in the 3 Ω resistor?

A Barangay power station supplies 60 kW to a load over 2,500 ft, 100 mm², two-conductor copper feeder, the resistance of which is 0.078 ohm per 1000 ft. The bus bar voltage is maintained constant at 600 V. Determine the load current.

A certain process uses warm water at rate of 2 liters per minute. The water enters at electric heater at 25 deg C to 50 deg C. Assuming no heat losses, what is the wattage of the heater?

Three parallel connected resistors when connected across a dc voltage source dissipate a total power of 72 W. The total current drawn is 6 A, the current flowing through the first resistor is 3 A and the second and third resistors have equal value. What are the resistances of the three resistors?

A wire-wound resistor is to be made from 0.2 mm diameter constantan wire wound around a cylinder that is 1 cm in diameter. How many turns of wire are required for a resistance of 50 Ω at 20 °C?