Transformer

Solve the textbook problems - transformer:

a) N1 = 40, N2 = 80, U2 = 80 V, U1 =?

b) N1 = 400, U1 = 200 V, U2 = 50 V, N2 =?

Correct answer:

U₁ =  40 V
N₂₂ =  100

Step-by-step explanation:

$$\begin{gathered} N_1=40 \\ {N}_2=80 \\ {U}_2=80\text{ V } \\ {N}_1:N_2=U_1:U_2 \\ {U}_1={\displaystyle \frac{N_1}{N_2}}\cdot U_2={\displaystyle \frac{40}{80}}\cdot 80=40\text{ V} \end{gathered}$$

$$\begin{gathered} N_{21}=400 \\ {U}_{21}=200\text{ V } \\ {U}_{22}=50\text{ V } \\ {N}_{22}={\displaystyle \frac{U_{22}}{U_{21}}}\cdot N_{21}={\displaystyle \frac{50}{200}}\cdot 400=100 \end{gathered}$$

Try another example

Related math problems and questions:

• Two resistors
  Two resistors 20 Ω and 60 Ω are connected in series and an external voltage of 400 V is connected to them. What are the electrical voltages on the respective resistors? Please comment!
• Transformer
  Transformer - U1 = 230 V, N1 = 300, N2 = 1,200, I1 = 4 A. Calculate the transformation ratio, voltage and current in the secondary coil.
• Electric input power
  Solve problems related to electric power: a) U = 120 V, I = 0.5 A, P =? b) P = 200 W, U = 230 V, I =? c) I = 5 A, P = 2200W, U =?
• Resistance
  Determine the resistance of the bulb with the current 200 mA and is in a regular lamp (230V).
• Mains voltage
  How much electric current flows through the appliance with a resistance of 40kΩ, which is connected to the mains voltage (230 V)?
• The transformer
  The primary coil of the transformer 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.
• Filament of bulb
  The filament of bulb has a 1 ohm resistivity and is connected to a voltage 220 V. How much electric charge will pass through the fiber when the electric current passes for 10 seconds?
• Coils of transformer
  The primary coil of the transformer has 400 turns, a current of 1.5 A passes through it and is connected to a voltage of 220 V. For the secondary coil, find the voltage, current, and a number of turns if the transformation ratio k = 0.1.
• Resistors
  Two resistors connected in series give the resulting resistance 245Ω and 60Ω in parallel. Determine the resistance of these resistors.
• Lowest voltage
  Three resistors with resistors R1 = 10 kΩ, R2 = 20 kΩ, R3 = 30 kΩ are connected in series and an external voltage U = 30 V is connected to them. On which resistor is the lowest voltage?
• The output
  The output voltage of the transformer is 880 V. The secondary coil has 1200 turns. Find the voltage to which the primary coil is connected and how many turns it has if a current of 1 A flows through it. Transformation ratio k = 4. What current flows throu
• Coils of transformer
  The primary coil of the transformer has 1100 turns and is connected to a voltage of 220V. How many turns does the secondary coil have when the voltage on it is 55 V? Find the transformation ratio and decide what kind of transformation.
• Athletic competition
  In a 400 meter athletic competition, a participant covers the distance as given below. find the average speed? first 80 meters 10 m/s next 240 meters 7.5 m/s last 80 meters 10 m/s
• Resistance - ohms
  If the resistance of the first resistor is 300 ohms and the resistance of the second resistor is 100 ohms. What is the resulting resistance?
• Voltmeter range
  We have a voltmeter which in the original set measures voltage to 10V. Calculate the size of the ballast resistor for this voltmeter, if we want to measure the voltage up to 50V. Voltmeter's internal resistance is 2 kiloohm/Volt.
• 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).
• Cooker
  A current of 2A passes through the immersion cooker at a voltage of 230V. What work do the electric field forces in 2 minutes?