Electrical engineering - practice problems - page 6 of 11
Number of problems found: 202
- Consumption 44071
Calculate the electric motor's power if it works for 10 minutes, and the electricity meter measured the consumption of 500 Wh. - Divisions 43621
With a measuring range of 30mA, the hand points to 20 divisions out of 100 divisions of the scale. What current is measured? - Scale of voltmeter Which scale division (scale has 100 divisions) must the voltmeter hand point at a measuring range of 300V if we want to measure a voltage of 100V?
- Conductor 43201
An electric charge of 10 C passed through the conductor in 50 s. What electric current passed through the conductor? - Conductor 43191
An electric current of 100 mA flowed through the conductor for 160 s. What electric charge passed through it? - Circuit voltage
Calculate the closed-circuit voltage. Calculate the power on the resistors. R1 = 30 ohms, R2 = 10 ohms. I = 0.1A. U =?. The resistors are connected in series, one after the other. - The box
Does the box contain three light bulbs with a wattage of 40 W and two pieces of light bulbs with a wattage of 60 W. What is the probability of the event that two randomly selected light bulbs will both be 40 W?
- Electrical 40291
At a certain point, we measured a voltage of 4.5V at a current of 150 mA at the bulb's terminals connected to the electrical circuit. What is the resistance of the bulb? - The resistance What is the resistance of an aluminum wire, 0.2 km long and 10 mm in diameter?
- Electrostatic
A proton with mass mp = 1.67.10-27 kg and electric charge e = 1.6.10-19 C, whose initial velocity was zero, is acted upon by a homogeneous electrostatic field of unknown intensity E. The proton moves in the direction of the lines of force and on a path s - Separated 38223
What is the intensity of the electric field at a point that lies in the middle between two point charges Q1 = 5.10-5 C and Q2 = 7.10-5 C, which is separated by r = 20 cm? The charges are placed in a vacuum. - Protector 37111 1. Describe the path through which the current causing the injury flows. 2. Justify why we should use the lowest type of protector A in our country.
- Copper winding
Calculate the current flowing through the copper winding at an operating temperature of 70°C Celsius if the winding diameter is 1.128 mm and the coiled length is 40 m. The winding is connected to 8V. - Current in the conductor Calculate the current in the conductor (in mA) if it is connected to a 4.5 V voltage source and its resistance is 20 (ohm).
- Resistance 34891 What is the voltage in the circuit if its total resistance is 920 (Ohms) and the current is 250 mA?
- The bulb
What is the resistance of a filament lamp when it is connected to a 9V battery and has a current of 120 mA? - Temperature 34641 The aluminum line has a resistance of 7.6Ω at -10˚C. What will be its resistance at a temperature of + 50˚C?
- RC time constant
You introduced 1 Coulomb worth of electrons into the inner volume of a dielectric material with ϵr=6. Thirty minutes later, you found that only 36.79% of the electrons were in the internal volume. Determine the conductivity σ of the dielectric material. - Maxwell’s inductance bridge
The four arms of Maxwell's inductance bridge are as follows: Arm AB contains an inductive coil of inductance L1 with resistance R1. Arms BC and CD contain non-inductive resistances of 200Ω and 100Ω, respectively. Arm AD contains a standard inductor of ind - Resistance 31421 What resistance must the electric element have to pass through a current of 4.4A at a voltage of 220V?
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