Electric Circuits
What is a circuit?
A closed path that allows electric current to flow.
What is the symbol for voltage?
V.
What is the formula for electrical power?
Power= Voltage x Current (P=VI)
Which circuit type allows components to work independently?
Parallel circuit.
What is the formula of Ohm's Law?
V=IR
What device is used to open or close a circuit?
A switch.
What unit is used to measure electric current?
Amperes (amps).
What is one kilowatt equal to in watts?
1000 watts.
In which type of circuit is the total resistance the sum of all resistors?
Series circuit.
If the current is 2 A and the resistance is 5Ω, what is the voltage?
10 V
What happens in an open circuit?
The current stops flowing.
In a simple circuit, if the voltage increases, what happens to the current? (Resistance stays the same.)
The current increases.
What does a kilowatt-hour measure?
The amount of electrical energy used over time.
What happens to the brightness of bulbs in a series circuit as more bulbs are added?
They become dimmer.
What is the resistance if the voltage is 12 V and the current is 4 A?
3Ω.
What type of circuit has only one path for electrical current?
Series circuit.
What device is used to measure current?
An ammeter.
If a device uses 1.5 kW of power for 3 hours, how much energy does it consume?
4.5 kWh.
How is voltage distributed in a series circuit?
It is divided among components.
If resistance increases and voltage stays the same, what happens to the current?
It decreases.
What is the main disadvantage of a series circuit in a household setting?
If one component fails, the entire circuit stops working.
Define voltage in terms of energy.
Voltage is the electric potential difference; it's the energy per unit charge.
A 120 V appliance draws 10 A. What is its power consumption?
1200 W.
Why are household circuits wired in parallel?
So devices can operate independently and at full voltage.
Rearrange Ohm's Law to solve for resistance.
R= V/I.