HEMISPHERES 3.0 LEVEL VII DISCHARGE &
PREVENTION EXAM QUESTIONS WITH
CORRECT ANSWERS
1. If a wire with a resistance of 5 ohms carries a current of 2 amperes for 1
minute, how much energy is dissipated in that time period?
600 joules
120 joules
300 joules
240 joules
2. Explain what a negative current value indicates about the assumptions
made in a circuit analysis.
It shows that the circuit has a short circuit.
It indicates that the initial direction of current flow was incorrect.
It means that the resistance is too high.
It suggests that the battery is dead.
3. As temperature increases, ____ _.
The resistance of a conductor decreases
The resistance of a conductor increases
The resistance of a conductor remains the same
The voltage of the conductor decreases
,4. What is the primary purpose of a Wheatstone bridge in electrical circuits?
To measure voltage
To measure unknown resistances
To calculate power dissipation
, To determine current flow
5. What principle is used to determine the length of a segment in a circuit
when the galvanometer reading is zero?
Ohm's Law
Kirchhoff's Voltage Law
Thevenin's Theorem
Nodal Analysis
6. Explain why connecting two 1 kΩ resistors in parallel results in a total
resistance of 500 Ω.
The resistors share the current, reducing the total resistance.
The voltage across each resistor is doubled, increasing the total
resistance.
The resistors combine their resistances, leading to a higher total
resistance.
The resistors are in series, which adds their resistances.
7. If a heating element has a resistance of 10 ohms at 20°C and 15 ohms at
100°C, calculate the power dissipated when connected to a 120 V power
supply at both temperatures. Which temperature results in higher power
dissipation?
Power at 20°C: 144 W, Power at 100°C: 96 W
Power at 20°C: 120 W, Power at 100°C: 80 W
Power at 20°C: 72 W, Power at 100°C: 48 W
Power at 20°C: 60 W, Power at 100°C: 40 W
8. What is the formula used to calculate the internal resistance of a battery?
Internal resistance = terminal voltage - emf
PREVENTION EXAM QUESTIONS WITH
CORRECT ANSWERS
1. If a wire with a resistance of 5 ohms carries a current of 2 amperes for 1
minute, how much energy is dissipated in that time period?
600 joules
120 joules
300 joules
240 joules
2. Explain what a negative current value indicates about the assumptions
made in a circuit analysis.
It shows that the circuit has a short circuit.
It indicates that the initial direction of current flow was incorrect.
It means that the resistance is too high.
It suggests that the battery is dead.
3. As temperature increases, ____ _.
The resistance of a conductor decreases
The resistance of a conductor increases
The resistance of a conductor remains the same
The voltage of the conductor decreases
,4. What is the primary purpose of a Wheatstone bridge in electrical circuits?
To measure voltage
To measure unknown resistances
To calculate power dissipation
, To determine current flow
5. What principle is used to determine the length of a segment in a circuit
when the galvanometer reading is zero?
Ohm's Law
Kirchhoff's Voltage Law
Thevenin's Theorem
Nodal Analysis
6. Explain why connecting two 1 kΩ resistors in parallel results in a total
resistance of 500 Ω.
The resistors share the current, reducing the total resistance.
The voltage across each resistor is doubled, increasing the total
resistance.
The resistors combine their resistances, leading to a higher total
resistance.
The resistors are in series, which adds their resistances.
7. If a heating element has a resistance of 10 ohms at 20°C and 15 ohms at
100°C, calculate the power dissipated when connected to a 120 V power
supply at both temperatures. Which temperature results in higher power
dissipation?
Power at 20°C: 144 W, Power at 100°C: 96 W
Power at 20°C: 120 W, Power at 100°C: 80 W
Power at 20°C: 72 W, Power at 100°C: 48 W
Power at 20°C: 60 W, Power at 100°C: 40 W
8. What is the formula used to calculate the internal resistance of a battery?
Internal resistance = terminal voltage - emf
