16 Questions
Which direction do electrons actually flow in an electric circuit?
From the negative terminal to the positive terminal
What is the unit for electric charge?
Coulomb
What is the correct definition of electric current?
The rate of charge flow measured as charge over time
What is the relationship described by Ohm's Law?
V = I/R
How does increasing voltage affect current in a circuit?
Increases current
The unit for electric current is the ______
ampere
Electric current flows from the ______ terminal to the negative terminal according to conventional current
positive
Increasing the resistance in a circuit will ______ the current
decrease
What is the SI unit of resistance?
Ohm
An electron has a charge of 1.6 x 10^-19 ______
coulombs
Ohm's Law describes the relationship between voltage (V), current (I), and ______
resistance
Calculations involve determining electric charge passing through a circuit, the number of electrons representing that charge, current passing through a ______
resistor
Electric power is the product of voltage and ______
current
Power is measured in ______
watts
Voltage of the motor is 125 volts, with a current of 0.4 amps, leading to an internal resistance of 312.5 ______ using Ohm's law
ohms
Increasing the voltage in a circuit will increase the ______
current
Study Notes
- Electric current flows from the positive terminal to the negative terminal according to conventional current, but in reality, electrons flow from the negative terminal to the positive terminal.
- Current is defined as the rate of charge flow, calculated as charge divided by time (I = ΔQ/Δt). The unit for current is the ampere (amp).
- Electric charge is measured in coulombs, with 1 ampere being equal to 1 coulomb per second. An electron has a charge of 1.6 x 10^-19 coulombs.
- Ohm's Law describes the relationship between voltage (V), current (I), and resistance (R) as V = IR. Resistance is measured in ohms.
- Increasing the voltage in a circuit will increase the current, while increasing the resistance will decrease the current. Voltage and current are directly related, while resistance and current are inversely related.
- Electric power is the product of voltage and current, with three forms of the equation: P = VI, P = I^2 * R, and P = V^2 / R. Power is measured in watts.
- In problem-solving scenarios, calculations involve determining electric charge passing through a circuit, the number of electrons representing that charge, current passing through a resistor, power dissipated by a resistor, power delivered by a battery, electrical resistance of a component, energy consumption, and operating costs.- Voltage of the motor is 125 volts, with a current of 0.4 amps, leading to an internal resistance of 312.5 ohms using Ohm's law.
- A charge of 12.5 coulombs flows through a 5 kilo ohm resistor in 8 minutes, resulting in an electric current of 0.026 amps (26 milliamps) when converted to seconds.
- The power consumed by the resistor is calculated to be 3.38 watts using the equation P = I^2 * R with current as 0.026 amps and resistance as 5 kilo ohms (5000 ohms).
- The voltage across the resistor is determined to be 130 volts by multiplying the current of 0.026 amps with the resistance of 5000 ohms.
Test your knowledge on electric current, voltage, power, and Ohm's Law with this quiz covering concepts such as current flow direction, charge measurement, Ohm's Law equation, power calculations, and problem-solving scenarios in circuits.
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