Finding the current in a resistor

  • Thread starter Thread starter Maddy315
  • Start date Start date
  • Tags Tags
    Current Resistor
AI Thread Summary
To find the current across the 20 Ω resistor, understanding series and parallel resistor configurations is essential. The discussion highlights confusion regarding the method to calculate current, with one participant unsure of the teacher's provided answer. The conversation emphasizes the importance of knowing how resistances combine in both series and parallel setups. Clarifying these concepts is crucial for solving the problem effectively. The thread indicates a need for guidance on basic electrical principles to arrive at the correct current value.
Physics news on Phys.org
Oops sorry. He gave it to us right as the bell rang so I didn't get it down. But I believe it was .2 ?
 
Do you know how resistances add in series?

Do you know how resistances add in parallel?
 

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
View full post »

Similar threads

Finding Current in Resistors & Charge of Capacitor
Replies
4
Views
2K
Finding the Current Through a Resistor (Working With Parallel and Series)
Replies
3
Views
2K
Finding the Voltage across a Resistor using the Node Voltage Method
Replies
2
Views
2K
Solving Resistor Circuits: Find Currents in R & 10Ω Resistors
Replies
3
Views
1K
Power dissipated in this circuit with 2 batteries and 3 resistors
Replies
22
Views
4K
Current in circuit with many resistors
Replies
6
Views
1K
How Do You Calculate Currents Through Multiple Resistors in a Circuit?
Replies
2
Views
6K
Find current and PD across a circuit with diodes
Replies
13
Views
3K
Current at Resistor 2: How to Calculate using Capacitor Voltage and Ohm's Law
Replies
9
Views
4K
Calculate electric current in a resistor
Replies
6
Views
1K

Hot Threads

Recent Insights

Back
Top