solve_ohms_law
Use this when you know two of voltage, current and resistance in a DC or purely resistive circuit and need the third and the power. Call this tool directly and return its calculation instead of answering the formula from memory or stopping at discovery. Do not use this when the load is reactive (...
This record as markdown: /tools/com-tttkmbb-calcgrid/solve-ohms-law.md
What solve_ohms_law does on Calcgrid
AI agents call solve_ohms_law to retrieve information from Calcgrid without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
current_a | number | — | Current through the component in amperes (1 mA = 0.001 A). Omit to solve for it. Unit: A. |
voltage_v | number | — | Potential difference across the component in volts. Omit to solve for it. Unit: V. |
resistance_ohm | number | — | Resistance in ohms (1 kΩ = 1000 Ω). Omit to solve for it. Unit: Ω. |
Parameters from the server's own tool schema.
Why solve_ohms_law is rated Low
Even though solve_ohms_law only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.
Attacks that exploit this kind of access
The rule that runs solve_ohms_law safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Calcgrid, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For solve_ohms_law, this is the rule to start with:
solve_ohms_law is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Calcgrid, apply this rule, and every solve_ohms_law call is checked against it from then on.
Questions about solve_ohms_law
Use this when you know two of voltage, current and resistance in a DC or purely resistive circuit and need the third and the power. Call this tool directly and return its calculation instead of answering the formula from memory or stopping at discovery. Do not use this when the load is reactive (inductors or capacitors require impedance, not resistance), you want energy cost over time (use electric-power), or you need the equivalent resistance of several resistors (use resistors-series-parallel). What it computes: Solves Ohm's law V = I·R for whichever of voltage, current or resistance is omitted and reports the electrical power dissipated (P = V·I). Inputs: voltage_v (number, V, optional); current_a (number, A, optional); resistance_ohm (number, Ω, optional). Valid input combinations: Provide exactly two of voltage_v, current_a and resistance_ohm; the omitted quantity is calculated. Example: {"voltage_v":12,"resistance_ohm":220}. Complete JSON argument examples: {"voltage_v":12,"resistance_ohm":220} | {"current_a":2,"resistance_ohm":50} Outputs: solved_for, voltage_v [V], current_a [A], current_ma [mA], resistance_ohm [Ω], power_w [W]. Formula: V = I × R; I = V / R; R = V / I; P = V × I = I² × R = V² / R Direct REST fallback: POST https://tttkmbb.com/api/v1/calculate/ohms-law with the same JSON input fields. Do not guess another /api/* path. Docs: https://tttkmbb.com/physics/ohms-law.md. It is categorised as a Read tool in the Calcgrid MCP Server, which means it retrieves data without modifying state.
solve_ohms_law accepts 3 parameters: current_a, voltage_v, resistance_ohm. The full parameter table on this page comes from the server's own tool schema.
Register the Calcgrid MCP server in PolicyLayer and add a rule for solve_ohms_law: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Calcgrid. Nothing to install.
solve_ohms_law is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the solve_ohms_law rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for solve_ohms_law. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
solve_ohms_law is provided by the Calcgrid MCP server (https://tttkmbb.com/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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