Electrical engineering - practice problems - page 6 of 11
Number of problems found: 213
- Fireplace power consumption
A current of 20 A passes through the heating spiral of the electric fireplace with a resistance of 10 Ω for 2.5 hours. Determine the power input of the fireplace and the consumed electrical energy - Bulb voltage current
The bulb's resistance at a power input of 40 W is 10 Ω. To what voltage source is it connected? How much current is flowing through it? - Bulb resistance Determine the resistance of a bulb whose wattage at a source voltage of 220 V is 15 W.
- Transmission of electricity
The electric field performs work 1610 J in the transmission of electric charge of 7 Coulombs between the heating coil terminals. Calculate the voltage between the terminals. - The output
The output voltage of the transformer is 880 V. The secondary coil has 1200 turns. Transformation ratio k = 4. Find the voltage to which the primary coil is connected. How many turns does the primary coil have if a current of 1 A flows through it? What cu - The transformer The transformer's primary coil has 1100 turns and is connected to a voltage of 220 V. How many turns does the secondary coil have when it has a voltage of 55 V? Determine the transformation ratio and decide what the transformation is.
- Motor power
Calculate the electric motor's power if it works for 10 minutes, and the electricity meter measured the consumption of 500 Wh. - Current measurement With a measuring range of 30 mA, 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 300 V if we want to measure a voltage of 100 V?
- Electric current
An electric charge of 10 C passed through the conductor in 50 s. What electric current passed through the conductor? - Electric charge
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 = 0.1 A. 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? - Bulb resistance At a certain point, we measured a voltage of 4.5 V 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, initially at rest, is acted upon by a uniform electrostatic field of unknown intensity E. The proton moves in the direction of the field lines and over a path s = 22 cm acquire - Electric field intensity
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. - Questions on sync motor
1. In an asynchronous motor, does the drawn current with the increasing mechanical load grow or decrease? 2. How is the difference between the revolutions of the magnetic field of the stator and the revolutions of the rotor called? 3. What is the meaning - Current injury protection 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.
- Electric motors
1. What frequency does the electrical distribution network in Europe have? 2. Write what revolutions a synchronous motor with three pole shoes should have? 3. By what device would you increase or decrease the revolutions of an electric motor? 4. Write why
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