WorksheetsOhm's Law and Circuits Test
Total questions: 20
Worksheet time: 10mins
Which of the following best describes a closed circuit?
A path that is broken
A continuous path for current flow
A circuit with excessive resistance
A circuit with no voltage
What happens in an open circuit?
Current can flow freely
Current is interrupted
Voltage increases
The resistance becomes zero
If a switch in a circuit is open, how does it affect the current?
Current flows normally
Current decreases
No current flows
Current flows only through the switch
In a closed circuit, which of the following is true?
The circuit has high resistance
The circuit can power devices
The circuit must have a resistor
The circuit cannot have a power source
What must be the condition for a circuit to be classified as closed?
All components must be connected
There must be no resistors
Power source must be absent
The circuit can have broken components
In a series circuit, if one component fails, what happens to the circuit?
The circuit remains closed
Only the failed component stops working
The entire circuit stops working
The voltage increases
Which property is true for resistors in a parallel circuit? (may be more than 1 answer)
The voltage across each resistor is the same
The total resistance is greater than the smallest resistor
What is the total resistance in a series circuit?
The sum of all individual resistances
The average of all resistances
The product of all resistances
None of the above
What happens to the total current in a parallel circuit when more branches are added?
It decreases
It remains constant
It increases
It becomes infinite
Which circuit configuration allows for components to operate independently?
Series
Parallel
Open
Closed
What symbol is commonly used to represent a resistor in electrical diagrams?
A straight line
A zigzag line
A circle
A triangle
In circuit diagrams, what does a straight line represent?
Wire
Resistor
Capacitor
Inductor
Which symbol indicates a power source in electrical diagrams?
A zigzag line
Two parallel lines, one longer than the other
A circle
A triangle
What does the symbol for ground in a circuit diagram look like?
A horizontal line with three descending lines
A circle
A vertical line with a triangle
A dotted line
Which of the following represents a capacitor in circuit diagrams?
Two parallel lines
A zigzag line
A broken line
A rectangle
A resistor has a resistance of 10 ohms and a current of 2 amperes flowing through it. What is the voltage across the resistor?
5 volts
10 volts
20 volts
30 volts
If a circuit has a voltage of 12 volts and a current of 3 amperes, what is the resistance of the circuit?
2 ohms
4 ohms
12 ohms
36 ohms
A bulb operates at a voltage of 120 volts and draws a current of 0.5 amperes. What is the resistance of the bulb?
60 ohms
120 ohms
240 ohms
100 ohms
A circuit has a resistance of 15 ohms and is connected to a 30-volt battery. How much current flows through the circuit?
0.5 amperes
1 ampere
2 amperes
3 amperes
If a device uses 150 watts of power and operates at a voltage of 120 volts, what is the current flowing through the device?
0.5 amperes
1 ampere
1.25 amperes
