16 Questions
What is the correct formula for calculating current?
I = Q/Δt
If the voltage and resistance in a circuit are known, what formula can be used to find the current?
I = V/R
What is the unit for current?
Amperes
How is electric power calculated?
$P = IV$
What happens to voltage when current in a circuit increases?
Voltage increases
What defines the direction of conventional current flow?
Positive terminal
In terms of charge and time, what is the correct formula for electric charge?
$Q = It$
If the charge flowing through a resistor is doubled, what happens to the current?
Current doubles
Which formula can be used to calculate charge flow when resistance and time are known?
$Q = 2It$
What does a higher refractive index indicate about a medium?
It is more optically denser
Why is the absolute refractive index always greater than one?
Light travels from a rarer medium to a denser medium
Why is refractive index considered unitless?
It is a ratio of similar quantities
What does the relative refractive index compare?
Refractive indices of two different media
Can the relative refractive index be equal to 1?
Yes, if the two media have identical optical densities
In which type of medium does light travel faster according to refractive index?
Medium with lower refractive index
What does the ratio n = c/v represent in terms of light speed?
Speed of light in vacuum to that in a specific medium
Study Notes
- Conventional current states that current flows from the positive terminal to the negative terminal, while 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) where Q is the electric charge measured in coulombs and t is the time in seconds. The unit for current is amperes (amps), where 1 amp = 1 coulomb per second.
- Ohm's Law describes the relationship between voltage (V), current (I), and resistance (R): V = IR. Resistance is measured in ohms, and increasing current leads to an increase in voltage, while increasing resistance leads to a decrease in current.
- Electric power is the product of voltage and current (P = VI), measured in watts. It can also be calculated as I^2R or V^2/R.
- In a circuit, power delivered by the battery must equal the power dissipated by the resistor for energy balance.
- In a problem involving current flow and time, electric charge (Q) can be calculated as Q = It, where I is the current and t is the time. Conversion of units may be necessary for accurate calculations.
- The relationship between charge and number of electrons is proportional; one electron has a charge of 1.6 x 10^-19 coulombs.- The voltage in part a is 125 volts.
- The internal resistance of the motor is 312.5 ohms.
- The charge flowing through the resistor is 12.5 coulombs.
- The electrical resistance of the resistor is 5 kilo ohms.
- The electric current flowing through the resistor is 0.026 amps or 26 milliamps.
- The power consumed by the resistor is 3.38 watts.
- The voltage across the resistor is 130 volts.
Test your knowledge of electricity and circuits with this quiz covering topics such as conventional current, Ohm's Law, electric power, energy balance in circuits, and charge calculations. Practice solving problems involving voltage, current, resistance, power, and charge conversions.
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