Ohm's Law and Power Flashcards
Current is affected by two factors?
VOLTAGE
RESISTANCE
Voltage is the electrical pressure or force that makes current flow in a circuit. As voltage increases, ______ also increases, provided _____ stays the same.
Voltage is the electrical pressure or force that makes current flow in a circuit. As voltage increases, current also increases, provided resistance stays the same.
Resistance is the opposition to current flow. As resistance increases, _____ decreases, provided _____ stays the same
Resistance is the opposition to current flow. As resistance increases, current decreases, provided voltage stays the same
What is Ohm’s Law?
What is the formula?
Ohm’s Law: Current is directly proportional to voltage and inversely proportional to resistance.
Formula: Voltage equals current times resistance (V=IR). You can solve for voltage (V) if you know current (I) and resistance (R).
Work is done when a body moves in response to an applied force. Power is the time rate of doing work. What is the formula for Work?
Work = Power x Time
For example, the amount of heat an object gives off or generates in a certain period of time is described in terms of ______
For example, the amount of heat an object gives off or generates in a certain period of time is described in terms of power.
Other than slowing down current, what else makes resistors useful?
It’s ability to Dissipate, or to give off of heat.
The unit of measure for power is what?
The watt.
Power is directly proportional to what?
One watt of power is used when 1 ____ moves 1 ______.
What is the formula for Power?
Power is directly proportional to voltage.
One watt of power is used when 1 volt moves 1 amp. This means power equals voltage times current.
Formula: P = V x I
If a series circuit has more than one resistor, the values of all the resistors must be _____ together before you calculate current.
If the circuit has more than one resistor, the values of all the resistors must be added together before you calculate current.
