Electrical engineering - practice for 13 year olds - page 2 of 6
Number of problems found: 111
- Resistance 80606
How much resistance must be connected in parallel with the 1-ohm resistor to make the total resistance 0.6 ohm? - A charge
A charge of 9 C passes through series-connected resistors with resistances of 40 ohms and 60 ohms in 1 minute. a) What voltage are they connected to? b) Calculate the voltage across each resistor. - Resistances 80604
Resistors with resistances of 6 ohms and 10 ohms are connected in series to a voltage of 24 V. a) How much current passes through them? b) What are the voltages on the individual resistors? - Resistance 80577
Three identical resistors connected in series have a total resistance of 9 ohms. What will be their total resistance when connected in parallel
- Electrical 80549
The factory hall is lit by 76 light bulbs, each of which has an input of 200W. Determine how much electrical work will be saved annually if the light is on an average of 100 minutes less per day. Consider 260 business days. - Osmium wire
A spiral of osmium wire has a resistance of 300 ohms at a temperature of 20 degrees Celsius. To what temperature was the coil heated if its resistance rose to 2940 ohms? (alpha=4*10-3 K-1) - Coefficient 80516
An aluminum wire has a resistance of 4.25 ohms at 0 degrees. Determine its resistance at a temperature of 200 degrees Celsius. The temperature coefficient of the electrical resistance of aluminum is 4.4·10-3K-1. - Coefficient 80514
The resistance of a platinum wire at a temperature of 20°C is 20 Ω, and when heated to 500°C, it increases to 59 Ω. Determine the mean temperature coefficient of platinum - Temperature 80513
A copper wire coil winding has a resistance of 10 Ω at a temperature of 14°C. The passing current by the coil heats up, and its resistance increases to 12.2 Ω. To what temperature did the coil winding heat up? α = 3.92 * 10-3 1/K.
- Conductor 80474
A constant current of 80mA passes through the wire. What charge passes through the conductor in 1 h? - Resistance 80473
Determine the source voltage to which we must connect a 1k ohm resistance wire if a current of 40 mA is to flow through it. - Resistance 80472
A current of 0.2 A flows through a light bulb connected to a voltage of 6 V. What is the resistance of the red-hot filament? - Calculate 80467
Calculate the current I that would race through resistor R5 (720 ohms), resistor R2 (220 ohms), and an LED (U=2V) at a DC 6V source. The resistors are connected in series. - Electric charge
The electric current in a microprocessor circuit is 0.230 μA. How many coulombs pass a given point in the circuit in 1.50 ms?
- Cross-section 71254
The steel conductors of the long-distance power line have a cross-section of 5 cm². Calculate the resistance of a steel wire with a length of 2 km if the resistivity of the steel is 13 * 10-8 Ω · m. - A fan
A fan with a resistance of 20 Ω is connected to a power supply. The current flowing through the circuit is 2.5 A. What is the voltage of the power supply? - Resistance 66074
Determine the current flowing through the car's starter, whose resistance is 60 milliohms at 12V - Resistances 66064
Two resistors with resistances of 40 ohms and 60 ohms are connected in series and connected to a voltage of 150V. A) the total resistance B) current in the circuit C) voltage on both resistors - Resistance 66054
The handset has a resistance of 4000 ohms. Calculate what voltage is connected to them if the current passes 2.5mA.
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Electrical engineering - practice problems. Maths practice for 13 year olds.