Ohm's law - practice problems - page 4 of 6
Directions: Provide a careful solution to each problem, showing all steps in your work.Number of problems found: 110
- 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. - 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. - 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 8 V. - 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).
- Circuit voltage
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 9 V battery and has a current of 120 mA? - Electric resistance calculation What resistance must the electric element have to pass through a current of 4.4 A at a voltage of 220 V?
- Series resistor calculation On sources with voltage U = 12 V, resistors R1 = 1 Ohm, R2 = 2 Ohm and R3 = 9 Ohm are connected in series. Determine the current I flowing from the source and the voltage drops U1, U2, and U3 on the individual resistors.
- Stove voltage drop A stove with a current of 4.0 A is connected to the 220 V voltage. The current has been reduced to 2.4 A due to a fault in the network. How much has the voltage in the socket dropped?
- 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! - Resistor parallel connection
Three resistors with resistances of 200 Ω, 400 Ω, and 600 Ω are connected next to each other (parallel). A current of 1.8 A flows through the first 200 Ω resistor. a) What current passes through the second and what current through the third resistor? b) W - Resistor series connection
Three resistors with resistances of 200 Ω, 400 Ω, and 600 Ω are connected in series (in series)—a current of 1.8 A flows through the first 200 Ω resistor. a) What current passes through the second and what current through the third resistor? b) What are t - 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?
- Kirchhoff's law Two resistors with 100 Ω and 300 Ω resistors are connected in series. A current of 1.8 A passes through the first 100 Ω resistor. What current flows through the second resistor?
- Mains voltage
How much electric current flows through the appliance with a resistance of 40 kΩ, connected to the mains voltage (230 V)? - Resistor voltage
The current of 25 mA passes through the resistor with a resistance of 50 Ω. How much voltage do we measure on it? - Appliance resistance power
Calculate the resistance and power of the appliance through which a current of 20 mA flows at the mains voltage (230 V). - Resistor voltage How much voltage do we measure on a 400 Ω resistor when an electric current of 55 mA passes through it?
- Closed circuit There is a voltage source with U1 = 12 V in a closed circuit and with internal resistance, R1 = 0.2 Ω. The external resistance is R2 = 19.8 Ω. Find the electric current and terminal voltage.
- Bulb resistance calculation The small bulb's socket has a reading of 6.3 V/0.3 A, which applies to its filament when the bulb is on. Determine the electrical resistance of the fiber under the given condition (the temperature of the fiber corresponds to about 2800 °C)
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